Updated openstack/openstack
Project: openstack/keystone  c0285c8f34236c188e8460bc17869e8f42fa23d9

Add v3 openstackclient CLI examples

Add some notes about authenticating with v3 keystone and
openstackclient. Also add some examples that don't exist in v2.0,
like domains and groups.

Change-Id: I92f9f9ab3ed4657f0771ad284ee6c4c613eca27c