FR: Compute / cmdline seems to miss the point on deployment

https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/compute/cmdline

I like the idea generally of `mvn exec:java` or `mvn exec:exec`, but this isn't how anyone would do it in production.  We really should have a production example here.

@jerjou I'm assigning to you as you were mentioned as the last assignee, feel free to unassign.