Make 'change_id' a stealth check

It's always going to return ':good' (unless it breaks), so don't show
the output (unless it breaks). Unless it breaks.

Change-Id: I04fd8062604cd671fde408618f8a89118bf09139
Reviewed-on: https://gerrit.causes.com/22295
Tested-by: Aiden Scandella <aiden@causes.com>
Reviewed-by: Aiden Scandella <aiden@causes.com>