anago: push to gcr.io/google-containers
anago: push to gcr.io/google-containers

staging-k8s.gcr.io now points to gcr.io/k8s-image-staging (a true
staging GCR separated from gcr.io/google-containers --- the way it
should be). But since we want GCRIO_PATH_PROD_PUSH to actually point to
a production GCR, we can't use staging-k8s.gcr.io; instead we point to
the actual underlying production GCR, gcr.io/google-containers.

kubernetes/release,kubernetes/release