Updated openstack/openstack
Project: openstack/keystone  ddaa748eb95b3ad6a2b1ab18df42560b49125739

Remove identity and assignment kvs backends

As part of deprecating the kvs backends, this patch removes those
for identity and assignment.

Partially implements: bp removed-as-of-kilo

Change-Id: I02566b3168b5f1792149b67e582d8e97ff02f8a6