Updated openstack/openstack
Project: openstack/keystone  a56d36311ca8a7e4ed6aa0f23685e9cb054dc27a

Allow users to clean up role assignments

This change allows users the ability to remove role assignments in the
event the user has been removed from the backend.

Closes-Bug: #1321378
Change-Id: I895e6e9718bc48344a53f192d5d56e6990da888e