Updated openstack/openstack
Project: openstack/keystone  20455f955646db10fb14fa7c1d3d20c61f5d8049

Remove deprecated KVS trust backend.

The trust backend is one of the KVS backends that was marked as
deprecated, for removal in Kilo. This patch removes it.

Partially implements: bp removed-as-of-kilo

Change-Id: Ib67cd33419d09e219d90ab8c50d375964a12640c