Add call to KS V3 revoke_token on logout
Add call to KS V3 revoke_token on logout

Change-Id: I6cf9c503e0ee32f71bb37ae5c3982315b8b7be3e
Closes-Bug: #1331978

ging/django_openstack_auth,promptworks/django_openstack_auth,ging/django_openstack_auth,redhat-openstack/django_openstack_auth,redhat-openstack/django_openstack_auth,dan1/django_openstack_auth_proto,promptworks/django_openstack_auth,dan1/django_openstack_auth_proto