Scripts and documentation still refer to pre-Go-module practices

[mhutchinson]

Almost anything that references GOPATH/src is from prior to go modules being fully adopted. It used to be that having all go code in that directory was expected (required?). Now it is only there if users go out of their way to check out code there.

I'm working on cleaning up the easy references to this, but there will be a long tail that might take some time to tidy up as they are deep in scripts that haven't been run in some time (e.g. scripts for running on public GCP).

[mhutchinson]

The remaining work here is in the example/deployment directories. git grep src/github.com/google/trillian seems a pretty good way to catch these:

examples/deployment/aws/terraform.tf:cd /go/src/github.com/google/trillian
examples/deployment/docker/db_client/Dockerfile:ADD . /go/src/github.com/google/trillian
examples/deployment/docker/db_client/Dockerfile:WORKDIR /go/src/github.com/google/trillian
examples/deployment/docker/db_server/Dockerfile:# expects the build context to be: $GOPATH/src/github.com/google/trillian
examples/deployment/kubernetes/deploy.sh:cd $GOPATH/src/github.com/google/trillian
examples/deployment/kubernetes/mysql/README.md:kubectl apply -f $GOPATH/src/github.com/google/trillian/storage/mysql/kubernetes
examples/deployment/kubernetes/mysql/README.md:$GOPATH/src/github.com/google/trillian/storage/mysql/kubernetes/resetdb.sh
examples/deployment/kubernetes/undeploy.sh:cd $GOPATH/src/github.com/google/trillian

Any changes to these files should be done with a working public environment to deploy them to, in order to confirm the new steps succeed.