Fix CI Errors Involving gRPC and old versions of Go

[RichVanderwal]

Something has happened to our CI testing so that older versions of Go can't use gRPC.

This quick one-liner will show that the latest gRPC module doesn't install properly into the official Go Docker images before Go version 1.13: for GOVERSION in `seq 7 16` ; do echo ====== GO VERSION 1.$GOVERSION ====== && docker run --rm -it golang:1.$GOVERSION bash -c "go get -u google.golang.org/grpc"; done

There is special logic in our build-script.sh to skip gRPC for 1.7 and 1.8, and we also do a special build for Go 1.9. Perhaps this is where we can fix this, after researching whether or not gRPC can run on earlier versions of Go anymore.

[RichVanderwal]

Fixed quite a few errors, but we still have four problem tests left:

• 1.13.x, _integrations/nrawssdk
• 1.15.x, v3/integrations/nrawssdk-v1, go get -u github.com/aws/aws-sdk-go@main
• 1.15.x, v3/integrations/nrecho-v4, go get -u github.com/labstack/echo@master
• 1.15.x, v3/integrations/nrgraphgophers, go get -u github.com/graph-gophers/graphql-...

It'll take another day or two to sort these out.