gcloud-docker: deprecate old Docker image.
gcloud-docker: deprecate old Docker image.

Change-Id: Ib8118092c6554cabb91a92dfcc392798f03e9378

cybrcodr/golang-docker,GoogleCloudPlatform/golang-docker,cybrcodr/golang-docker,GoogleCloudPlatform/golang-docker,shantuo/golang-docker,shantuo/golang-docker