BZ #1109329 - Start ceilometer notification agent service.

https://bugzilla.redhat.com/show_bug.cgi?id=1109329

This only applies to non-HA case since we do not yet have ceilometer included in
HA deployments.
Merge pull request #273 from jguiditta/bz1109329_ceilo_notifications

BZ #1109329 - Start ceilometer notification agent service.