Updated openstack/openstack
Project: openstack/keystone  1612cb416821f5b3463619fc5f0c3c00c780e884

Use oslo.i18n

Keystone was using the I18N functions from oslo-incubator. With
this change, Keystone uses the new oslo.i18n library.

The tests were adapted to not use internal symbols because these are
subject to change.

Change-Id: I1b13fcc630952695424fccd91bcd157d702851f1