vendor: Update go version to 1.15

We use octal of format `0o700` in `lokomotive/pkg/terraform_test`
package. Without this change the tests fail with following error on
go1.16:

```
octal literals requires go1.13 or later (-lang was set to go1.12; check
go.mod)
```

It needs go1.13 or later mentioned in `go.mod`. This commit updates
the go version in `go.mod`.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

go.mod

@@ -1,6 +1,6 @@
 module github.com/kinvolk/lokomotive
 
-go 1.12
+go 1.15
 
 require (
 	github.com/MakeNowJust/heredoc v1.0.0 // indirect

vendor/modules.txt

@@ -4,6 +4,7 @@ github.com/Azure/go-ansiterm/winterm
 # github.com/BurntSushi/toml v0.3.1
 github.com/BurntSushi/toml
 # github.com/MakeNowJust/heredoc v1.0.0
+## explicit
 github.com/MakeNowJust/heredoc
 # github.com/Masterminds/goutils v1.1.0
 github.com/Masterminds/goutils
@@ -40,8 +41,10 @@ github.com/PuerkitoBio/purell
 # github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578
 github.com/PuerkitoBio/urlesc
 # github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d
+## explicit
 github.com/StackExchange/wmi
 # github.com/agext/levenshtein v1.2.3
+## explicit
 github.com/agext/levenshtein
 # github.com/apparentlymart/go-textseg/v12 v12.0.0
 github.com/apparentlymart/go-textseg/v12/textseg
@@ -52,6 +55,7 @@ github.com/beorn7/perks/quantile
 # github.com/cespare/xxhash/v2 v2.1.1
 github.com/cespare/xxhash/v2
 # github.com/containerd/cgroups v0.0.0-20200308110149-6c3dec43a103
+## explicit
 github.com/containerd/cgroups/stats/v1
 # github.com/containerd/containerd v1.3.4
 github.com/containerd/containerd/archive/compression
@@ -70,6 +74,7 @@ github.com/containerd/containerd/remotes/docker/schema1
 github.com/containerd/containerd/sys
 github.com/containerd/containerd/version
 # github.com/containerd/continuity v0.0.0-20200228182428-0f16d7a0959c
+## explicit
 github.com/containerd/continuity/pathdriver
 # github.com/cpuguy83/go-md2man/v2 v2.0.0
 github.com/cpuguy83/go-md2man/v2/md2man
@@ -85,6 +90,7 @@ github.com/deislabs/oras/pkg/content
 github.com/deislabs/oras/pkg/context
 github.com/deislabs/oras/pkg/oras
 # github.com/docker/cli v0.0.0-20200312141509-ef2f64abbd37
+## explicit
 github.com/docker/cli/cli/config
 github.com/docker/cli/cli/config/configfile
 github.com/docker/cli/cli/config/credentials
@@ -103,6 +109,7 @@ github.com/docker/distribution/registry/client/transport
 github.com/docker/distribution/registry/storage/cache
 github.com/docker/distribution/registry/storage/cache/memory
 # github.com/docker/docker v1.13.1 => github.com/docker/engine v1.4.2-0.20191113042239-ea84732a7725
+## explicit
 github.com/docker/docker/api/types
 github.com/docker/docker/api/types/blkiodev
 github.com/docker/docker/api/types/container
@@ -136,20 +143,23 @@ github.com/docker/go-connections/nat
 github.com/docker/go-connections/sockets
 github.com/docker/go-connections/tlsconfig
 # github.com/docker/go-metrics v0.0.1
+## explicit
 github.com/docker/go-metrics
 # github.com/docker/go-units v0.4.0
 github.com/docker/go-units
 # github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96 => github.com/moby/spdystream v0.1.0
 github.com/docker/spdystream
 github.com/docker/spdystream/spdy
 # github.com/emicklei/go-restful v2.12.0+incompatible
+## explicit
 github.com/emicklei/go-restful
 github.com/emicklei/go-restful/log
 # github.com/evanphx/json-patch v4.9.0+incompatible
 github.com/evanphx/json-patch
 # github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d
 github.com/exponent-io/jsonpath
 # github.com/fatih/color v1.9.0
+## explicit
 github.com/fatih/color
 # github.com/fsnotify/fsnotify v1.4.9
 github.com/fsnotify/fsnotify
@@ -158,15 +168,18 @@ github.com/ghodss/yaml
 # github.com/go-logr/logr v0.2.0
 github.com/go-logr/logr
 # github.com/go-ole/go-ole v1.2.4
+## explicit
 github.com/go-ole/go-ole
 github.com/go-ole/go-ole/oleutil
 # github.com/go-openapi/jsonpointer v0.19.3
 github.com/go-openapi/jsonpointer
 # github.com/go-openapi/jsonreference v0.19.3
 github.com/go-openapi/jsonreference
 # github.com/go-openapi/spec v0.19.7 => github.com/go-openapi/spec v0.19.8
+## explicit
 github.com/go-openapi/spec
 # github.com/go-openapi/swag v0.19.8
+## explicit
 github.com/go-openapi/swag
 # github.com/gobwas/glob v0.2.3
 github.com/gobwas/glob
@@ -183,6 +196,7 @@ github.com/gogo/protobuf/proto
 github.com/gogo/protobuf/protoc-gen-gogo/descriptor
 github.com/gogo/protobuf/sortkeys
 # github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+## explicit
 github.com/golang/glog
 # github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
 github.com/golang/groupcache/lru
@@ -195,6 +209,7 @@ github.com/golang/protobuf/ptypes/timestamp
 # github.com/google/btree v1.0.0
 github.com/google/btree
 # github.com/google/go-cmp v0.5.2
+## explicit
 github.com/google/go-cmp/cmp
 github.com/google/go-cmp/cmp/internal/diff
 github.com/google/go-cmp/cmp/internal/flags
@@ -209,17 +224,21 @@ github.com/googleapis/gnostic/compiler
 github.com/googleapis/gnostic/extensions
 github.com/googleapis/gnostic/openapiv2
 # github.com/gorilla/mux v1.7.4
+## explicit
 github.com/gorilla/mux
 # github.com/gosuri/uitable v0.0.4
 github.com/gosuri/uitable
 github.com/gosuri/uitable/util/strutil
 github.com/gosuri/uitable/util/wordwrap
 # github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79
+## explicit
 github.com/gregjones/httpcache
 github.com/gregjones/httpcache/diskcache
 # github.com/hashicorp/go-version v1.2.0
+## explicit
 github.com/hashicorp/go-version
 # github.com/hashicorp/golang-lru v0.5.4
+## explicit
 github.com/hashicorp/golang-lru
 github.com/hashicorp/golang-lru/simplelru
 # github.com/hashicorp/hcl v1.0.0
@@ -234,6 +253,7 @@ github.com/hashicorp/hcl/json/parser
 github.com/hashicorp/hcl/json/scanner
 github.com/hashicorp/hcl/json/token
 # github.com/hashicorp/hcl/v2 v2.7.2
+## explicit
 github.com/hashicorp/hcl/v2
 github.com/hashicorp/hcl/v2/ext/customdecode
 github.com/hashicorp/hcl/v2/gohcl
@@ -242,6 +262,7 @@ github.com/hashicorp/hcl/v2/hclsyntax
 github.com/hashicorp/hcl/v2/hclwrite
 github.com/hashicorp/hcl/v2/json
 # github.com/hpcloud/tail v1.0.0
+## explicit
 github.com/hpcloud/tail
 github.com/hpcloud/tail/ratelimiter
 github.com/hpcloud/tail/util
@@ -259,7 +280,10 @@ github.com/jmoiron/sqlx/reflectx
 # github.com/json-iterator/go v1.1.10
 github.com/json-iterator/go
 # github.com/kardianos/osext v0.0.0-20190222173326-2bc1f35cddc0
+## explicit
 github.com/kardianos/osext
+# github.com/kylelemons/godebug v1.1.0
+## explicit
 # github.com/lann/builder v0.0.0-20180802200727-47ae307949d0
 github.com/lann/builder
 # github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0
@@ -271,30 +295,37 @@ github.com/lib/pq/scram
 # github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de
 github.com/liggitt/tabwriter
 # github.com/linkerd/linkerd2 v0.5.1-0.20200623171206-83ae0ccf0f1a
+## explicit
 github.com/linkerd/linkerd2/pkg/tls
 # github.com/magiconair/properties v1.8.1
 github.com/magiconair/properties
 # github.com/mailru/easyjson v0.7.1
+## explicit
 github.com/mailru/easyjson/buffer
 github.com/mailru/easyjson/jlexer
 github.com/mailru/easyjson/jwriter
 # github.com/mattn/go-colorable v0.1.6
+## explicit
 github.com/mattn/go-colorable
 # github.com/mattn/go-isatty v0.0.12
 github.com/mattn/go-isatty
 # github.com/mattn/go-runewidth v0.0.8
+## explicit
 github.com/mattn/go-runewidth
 # github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369
 github.com/matttproud/golang_protobuf_extensions/pbutil
 # github.com/mitchellh/copystructure v1.0.0
 github.com/mitchellh/copystructure
 # github.com/mitchellh/go-homedir v1.1.0
+## explicit
 github.com/mitchellh/go-homedir
 # github.com/mitchellh/go-wordwrap v1.0.1
+## explicit
 github.com/mitchellh/go-wordwrap
 # github.com/mitchellh/mapstructure v1.1.2
 github.com/mitchellh/mapstructure
 # github.com/mitchellh/reflectwalk v1.0.1
+## explicit
 github.com/mitchellh/reflectwalk
 # github.com/moby/term v0.0.0-20200312100748-672ec06f55cd
 github.com/moby/term
@@ -314,16 +345,20 @@ github.com/opencontainers/image-spec/specs-go/v1
 github.com/opencontainers/runc/libcontainer/system
 github.com/opencontainers/runc/libcontainer/user
 # github.com/packethost/packngo v0.2.0
+## explicit
 github.com/packethost/packngo
 # github.com/pelletier/go-toml v1.6.0
+## explicit
 github.com/pelletier/go-toml
 # github.com/peterbourgon/diskv v2.0.1+incompatible
 github.com/peterbourgon/diskv
 # github.com/pkg/errors v0.9.1
 github.com/pkg/errors
 # github.com/prometheus/alertmanager v0.20.0
+## explicit
 github.com/prometheus/alertmanager/pkg/modtimevfs
 # github.com/prometheus/client_golang v1.7.1
+## explicit
 github.com/prometheus/client_golang/api
 github.com/prometheus/client_golang/api/prometheus/v1
 github.com/prometheus/client_golang/prometheus
@@ -339,14 +374,18 @@ github.com/prometheus/common/model
 github.com/prometheus/procfs
 github.com/prometheus/procfs/internal/fs
 github.com/prometheus/procfs/internal/util
+# github.com/rogpeppe/go-internal v1.6.1
+## explicit
 # github.com/rubenv/sql-migrate v0.0.0-20200616145509-8d140a17f351
 github.com/rubenv/sql-migrate
 github.com/rubenv/sql-migrate/sqlparse
 # github.com/russross/blackfriday v2.0.0+incompatible => github.com/russross/blackfriday v1.5.2
+## explicit
 github.com/russross/blackfriday
 # github.com/russross/blackfriday/v2 v2.0.1
 github.com/russross/blackfriday/v2
 # github.com/shirou/gopsutil v2.20.2+incompatible
+## explicit
 github.com/shirou/gopsutil/cpu
 github.com/shirou/gopsutil/internal/common
 github.com/shirou/gopsutil/mem
@@ -355,37 +394,46 @@ github.com/shirou/gopsutil/process
 # github.com/shopspring/decimal v1.2.0
 github.com/shopspring/decimal
 # github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749
+## explicit
 github.com/shurcooL/httpfs/union
 github.com/shurcooL/httpfs/vfsutil
 # github.com/shurcooL/sanitized_anchor_name v1.0.0
 github.com/shurcooL/sanitized_anchor_name
 # github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd
+## explicit
 github.com/shurcooL/vfsgen
 # github.com/sirupsen/logrus v1.7.0
+## explicit
 github.com/sirupsen/logrus
 # github.com/spf13/afero v1.2.2
 github.com/spf13/afero
 github.com/spf13/afero/mem
 # github.com/spf13/cast v1.3.1
 github.com/spf13/cast
 # github.com/spf13/cobra v1.1.1
+## explicit
 github.com/spf13/cobra
 github.com/spf13/cobra/doc
 # github.com/spf13/jwalterweatherman v1.1.0
+## explicit
 github.com/spf13/jwalterweatherman
 # github.com/spf13/pflag v1.0.5
+## explicit
 github.com/spf13/pflag
 # github.com/spf13/viper v1.7.0
+## explicit
 github.com/spf13/viper
 # github.com/subosito/gotenv v1.2.0
 github.com/subosito/gotenv
 # github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb
+## explicit
 github.com/xeipuuv/gojsonpointer
 # github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415
 github.com/xeipuuv/gojsonreference
 # github.com/xeipuuv/gojsonschema v1.2.0
 github.com/xeipuuv/gojsonschema
 # github.com/zclconf/go-cty v1.7.0
+## explicit
 github.com/zclconf/go-cty/cty
 github.com/zclconf/go-cty/cty/convert
 github.com/zclconf/go-cty/cty/function
@@ -446,6 +494,8 @@ golang.org/x/text/unicode/norm
 golang.org/x/text/width
 # golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
 golang.org/x/time/rate
+# golang.org/x/tools v0.0.0-20200731060945-b5fad4ed8dd6
+## explicit
 # google.golang.org/appengine v1.6.5
 google.golang.org/appengine/internal
 google.golang.org/appengine/internal/base
@@ -457,6 +507,7 @@ google.golang.org/appengine/urlfetch
 # google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a
 google.golang.org/genproto/googleapis/rpc/status
 # google.golang.org/grpc v1.28.0
+## explicit
 google.golang.org/grpc/codes
 google.golang.org/grpc/connectivity
 google.golang.org/grpc/grpclog
@@ -500,12 +551,14 @@ gopkg.in/gorp.v1
 # gopkg.in/inf.v0 v0.9.1
 gopkg.in/inf.v0
 # gopkg.in/ini.v1 v1.54.0
+## explicit
 gopkg.in/ini.v1
 # gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7
 gopkg.in/tomb.v1
 # gopkg.in/yaml.v2 v2.3.0
 gopkg.in/yaml.v2
 # helm.sh/helm/v3 v3.5.1 => github.com/kinvolk/helm/v3 v3.5.1-2-g498bb0c0
+## explicit
 helm.sh/helm/v3/internal/experimental/registry
 helm.sh/helm/v3/internal/fileutil
 helm.sh/helm/v3/internal/ignore
@@ -542,6 +595,7 @@ helm.sh/helm/v3/pkg/storage
 helm.sh/helm/v3/pkg/storage/driver
 helm.sh/helm/v3/pkg/time
 # k8s.io/api v0.20.2
+## explicit
 k8s.io/api/admission/v1
 k8s.io/api/admission/v1beta1
 k8s.io/api/admissionregistration/v1
@@ -593,6 +647,7 @@ k8s.io/apiextensions-apiserver/pkg/apis/apiextensions
 k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1
 k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1
 # k8s.io/apimachinery v0.20.2
+## explicit
 k8s.io/apimachinery/pkg/api/equality
 k8s.io/apimachinery/pkg/api/errors
 k8s.io/apimachinery/pkg/api/meta
@@ -661,6 +716,7 @@ k8s.io/cli-runtime/pkg/kustomize/k8sdeps/validator
 k8s.io/cli-runtime/pkg/printers
 k8s.io/cli-runtime/pkg/resource
 # k8s.io/client-go v0.20.2 => k8s.io/client-go v0.20.2
+## explicit
 k8s.io/client-go/discovery
 k8s.io/client-go/discovery/cached/disk
 k8s.io/client-go/discovery/cached/memory
@@ -846,4 +902,12 @@ sigs.k8s.io/kustomize/pkg/types
 # sigs.k8s.io/structured-merge-diff/v4 v4.0.2
 sigs.k8s.io/structured-merge-diff/v4/value
 # sigs.k8s.io/yaml v1.2.0
+## explicit
 sigs.k8s.io/yaml
+# github.com/docker/docker => github.com/docker/engine v1.4.2-0.20191113042239-ea84732a7725
+# github.com/docker/spdystream => github.com/moby/spdystream v0.1.0
+# github.com/docker/distribution => github.com/docker/distribution v0.0.0-20191216044856-a8371794149d
+# github.com/russross/blackfriday => github.com/russross/blackfriday v1.5.2
+# helm.sh/helm/v3 => github.com/kinvolk/helm/v3 v3.5.1-2-g498bb0c0
+# github.com/go-openapi/spec => github.com/go-openapi/spec v0.19.8
+# k8s.io/client-go => k8s.io/client-go v0.20.2