Updated openstack/openstack
Project: openstack/keystone  8671b735f8867babe38b57d1fd5044fd88fc38cc
null
Switch to oslo-incubator mask_password

oslo-incubator has a mask_password now, so use that rather than
keystone's.

Change-Id: I3d89fb844086b85598ad3fd7ae0daa7599a26a30