Bug 959123: Suppress output from psql command during start/stop

https://bugzilla.redhat.com/show_bug.cgi?id=959123

The command that runs when checking for psql status was very verbose and
this came through to the user's terminal when using 'rhc
start|stop|restart'
Merge pull request #2475 from fotioslindiakos/Bug959977

Merged by openshift-bot