Move targets and packages from build-go to config-go

@filbranden This should help with building things not using the build-go script and doing it by hand.  This should be the last of the 'brains' in build-go.sh
Not sure hack/config-go.sh is already sourced when this is called...

@jbeda can you please confirm if this is safe?

Ditto the one below calling kube::binaries_from_targets