feat(modules): Use modules and go 1.13

* Specify go 1.13 for builds

* Add .mod and .sum files generated by go mod init

* Use a directory outside of $GOPATH for testing.

* Update docker files to use go 1.13.8 instead of 1.12 for most builds.

* Simplify go installation by piping from wget to tar.  This avoids
  having to do any cleanup.

* Build and test in a directory outside of GOPATH since we're using
  modules now.

* Update Jenkinsfile to build using modules by building directly inside
  of $WORKSPACE instead of in $GOPATH.

* Use go mod download instead of dep ensure to collect dependencies

* Remove Gopkg related data files.

* Replace calls to "dep ensure" with "go mod download"

* Replace check for being outside of $GOPATH to a check for being INSIDE
  of $GOPATH which is wrong when we're using modules

* Map $DIR to /root/influxdb in docker run command

* Clone source into /root/influxdb which is outside of our $GOPATH.

Dockerfile_build_ubuntu32

@@ -20,20 +20,20 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
 
 RUN gem install fpm
 
-# Install go
-ENV GOPATH /root/go
-ENV GO_VERSION 1.12
-ENV GO_ARCH 386
-RUN wget --no-verbose https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-   tar -C /usr/local/ -xf /go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-   rm /go${GO_VERSION}.linux-${GO_ARCH}.tar.gz
-ENV PATH /usr/local/go/bin:$PATH
+# setup environment
+ENV GO_VERSION  1.13.8
+ENV GOARCH      386
+ENV GOROOT      /usr/local/go
+ENV GOPATH      /root/go
+ENV PATH        $GOPATH/bin:$GOROOT/bin:$PATH
+ENV PROJECT_DIR /root/influxdb
+
+# install go
+RUN wget --no-verbose https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${GOARCH}.tar.gz -O- | tar -C /usr/local/ -zxf-
 
-ENV PROJECT_DIR $GOPATH/src/github.com/influxdata/influxdb
-ENV PATH $GOPATH/bin:$PATH
 RUN mkdir -p $PROJECT_DIR
-WORKDIR $PROJECT_DIR
 
+WORKDIR $PROJECT_DIR
 VOLUME $PROJECT_DIR
 
-ENTRYPOINT [ "/root/go/src/github.com/influxdata/influxdb/build.py" ]
+ENTRYPOINT [ "/root/influxdb/build.py" ]

Dockerfile_build_ubuntu64

@@ -22,20 +22,20 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
 
 RUN gem install fpm
 
-# Install go
-ENV GOPATH /root/go
-ENV GO_VERSION 1.12
-ENV GO_ARCH amd64
-RUN wget --no-verbose https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-   tar -C /usr/local/ -xf /go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-   rm /go${GO_VERSION}.linux-${GO_ARCH}.tar.gz
-ENV PATH /usr/local/go/bin:$PATH
+# setup environment
+ENV GO_VERSION  1.13.8
+ENV GOARCH      amd64
+ENV GOROOT      /usr/local/go
+ENV GOPATH      /root/go
+ENV PATH        $GOPATH/bin:$GOROOT/bin:$PATH
+ENV PROJECT_DIR /root/influxdb
+
+# install go
+RUN wget --no-verbose https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${GOARCH}.tar.gz -O- | tar -C /usr/local/ -zxf-
 
-ENV PROJECT_DIR $GOPATH/src/github.com/influxdata/influxdb
-ENV PATH $GOPATH/bin:$PATH
 RUN mkdir -p $PROJECT_DIR
-WORKDIR $PROJECT_DIR
 
-VOLUME $PROJECT_DIR
+WORKDIR $PROJECT_DIR
+VOLUME  $PROJECT_DIR
 
-ENTRYPOINT [ "/root/go/src/github.com/influxdata/influxdb/build.py" ]
+ENTRYPOINT [ "/root/influxdb/build.py" ]

Dockerfile_build_ubuntu64_go1.12

@@ -22,22 +22,20 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
 
 RUN gem install fpm
 
-# Install go
-ENV GOPATH /root/go
+# setup environment
+ENV GO_VERSION  1.12
+ENV GOARCH      amd64
+ENV GOROOT      /usr/local/go
+ENV GOPATH      /root/go
+ENV PATH        $GOPATH/bin:$GOROOT/bin:$PATH
+ENV PROJECT_DIR /root/influxdb
 
-ENV GO_VERSION 1.12
+# install go
+RUN wget --no-verbose https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${GOARCH}.tar.gz -O- | tar -C /usr/local/ -zxf-
 
-ENV GO_ARCH amd64
-RUN wget --no-verbose https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-   tar -C /usr/local/ -xf /go${GO_VERSION}.linux-${GO_ARCH}.tar.gz && \
-   rm /go${GO_VERSION}.linux-${GO_ARCH}.tar.gz
-ENV PATH /usr/local/go/bin:$PATH
-
-ENV PROJECT_DIR $GOPATH/src/github.com/influxdata/influxdb
-ENV PATH $GOPATH/bin:$PATH
 RUN mkdir -p $PROJECT_DIR
-WORKDIR $PROJECT_DIR
 
-VOLUME $PROJECT_DIR
+WORKDIR $PROJECT_DIR
+VOLUME  $PROJECT_DIR
 
-ENTRYPOINT [ "/root/go/src/github.com/influxdata/influxdb/build.py" ]
+ENTRYPOINT [ "/root/influxdb/build.py" ]