Updated openstack/openstack
Project: openstack/keystone  8612a54f91a6d5e4afe1fe2dc484c3fe063bbe58

Add notifications for policy, region, service and endpoint.

The endpoint policy extension will need to ensure stale
associations are removed on deletion of these entities. Delete
events are already generated for endpoints. For completeness,
create and update notifcations for these entities have also
been implemented.

Partially implements: bp endpoint-policy
Change-Id: I5de15459f5b577955056ecc166b450963e85bbc9