Comment out pom.xml sections related to deployment

A user reported this config doesn't work with Maven 3 for downloading
the extension necessary to define the Google Cloud Storage based Maven
repo. Rather than spend too much time debugging, just comment it out for
now; maintainers can uncomment on the rare occasions they need to
deploy.

Change-Id: Ibec9940b7774ec25e18cf910e1b61bd5e8560390