Updated openstack/openstack
Project: openstack/ceilometer  48a7bf242527b1846b48e6192b33996219538ecd

Add documentation for implemented identity meters

Add a list of Identity events they can be metered, specifically:

- user authentication
- project create/update/delete
- role create/update/delete
- user create/update/delete
- group create/update/delete
- trust create/delete

Change-Id: I7a2f25c9e5b64e8f3a2ff986660e5ed531d955c3