[BEAM-7011] Update Beam SDKs to use the StandardSideInputType enums.

[lukecwik]

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Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---	---	---	---	---
Java
Python		---			---	---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

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[lukecwik]

R: @lostluck
CC: @CraigChambersG

[lostluck]

@lukecwik You'll need to clean up the go imports for this change to compile, as Go has strict include what you use semantics.

18:02:25 .gogradle/project_gopath/src/github.com/apache/beam/sdks/go/pkg/beam/runners/dataflow/dataflowlib/fixup.go:19:2: imported and not used: "github.com/apache/beam/sdks/go/pkg/beam/core/runtime/graphx"
18:02:25 .gogradle/project_gopath/src/github.com/apache/beam/sdks/go/pkg/beam/runners/dataflow/dataflowlib/fixup.go:20:2: imported and not used: "github.com/apache/beam/sdks/go/pkg/beam/core/runtime/pipelinex"
18:02:25 .gogradle/project_gopath/src/github.com/apache/beam/sdks/go/pkg/beam/runners/dataflow/dataflowlib/fixup.go:21:2: imported and not used: "github.com/apache/beam/sdks/go/pkg/beam/core/util/protox"
18:02:25 .gogradle/project_gopath/src/github.com/apache/beam/sdks/go/pkg/beam/runners/dataflow/dataflowlib/fixup.go:23:2: imported and not used: "github.com/apache/beam/sdks/go/vendor/github.com/golang/protobuf/proto"

[lukecwik]

Thanks Robert

Is there tooling that does this automatically?

[lostluck]

There are, but most IDEs configured for Go should be automatically downloading and using them onsave.
The one that handles imports specifically, is goimports

[lukecwik]

R: @lostluck

[lostluck]

LGTM

[lostluck]

Note: I think the formatting changes in the go code are from go version differences for whomever is running go fmt. I think many of these changed (and I updated in a PR) after I updated my local go to 1.12.
Either way, they're benign if a bit noisy, and not worth nit-ing over.

[lukecwik]

Yes, I use go 1.12 locally, didn't know that the fmt had changed.

[lukecwik]

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