Updated openstack/openstack
Project: openstack/python-keystoneclient  41afe3c963fa01f61b67c44e572eee34b0972382

Docstring cleanup for return type

The :returns: directive doesn't take an argument. To specify the
return type, use the :rtype: directive.

Change-Id: I3aaab824792333b3f75a10af92f5b712cc9b4ff6