Add ability to enable OSprofiler

To enable OSprofiler we should be able to add "profiler" notification
topic to ceilometer notification topics.

More about OSprofiler:
https://github.com/stackforge/osprofiler

More about ceilometer plugin:
https://review.openstack.org/#/c/100239/

Sample of trace (via Cinder and Nova Services):
http://pavlovic.me/rally/profiler/

Change-Id: I6137174a3ecddd58f62e0f98b235b71b1c070f13
Merge "Add ability to enable OSprofiler"
Merge branch 'master' of github.com:openstack-dev/devstack