BZ #1100411 - Ceilometer starts before mongo is ready.

https://bugzilla.redhat.com/show_bug.cgi?id=1100411

Wait for the mongo service before starting ceilometer.

(cherry picked from commit 4a086d56593729203836abc98581f21acb806911)

Conflicts:
	puppet/modules/quickstack/manifests/ceilometer_controller.pp