Fix release versions of 'protoc-gen-go' and 'google.golang.org/grpc'

[walesey]

My team and I are currently using your grpc/go:1.0 docker image to generate go code from our proto files.

We found an issue where you had published multiple versions of the 1.0 tag that each had a different versions of protoc-gen-go. This meant that different members on my team were generating slightly different code from the same proto file. (each person had a different version of 1.0 in their local docker cache).

I've provided a fix for the Dockerimage that installs the protoc-gen-go/grpc dependencies from stable release builds instead.

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[srini100]

@walesey, please sign CLA.

[walesey]

testing CLA

[dfawley]

@walesey,

This is the 1.0/golang/Dockerfile but with your change, it fetches 1.13. It was fetching HEAD before, so technically this may be an improvement in some regard, but it's still misleading.

We would prefer not to maintain dockerfiles for Go in this repo any longer. The complexity of getting a grpc-go environment up and running does not justify it in our opinion. However, I'm not sure what problems we might cause if we just deleted this directory completely, either. As a user, do you have any input on this? Thanks!

[walesey]

Currently we find docker useful as a means of generating consistent go code from proto files. We just need to make sure the dependencies are locked down.

I've changed the grpc version to 1.0.