Updated openstack/openstack
Project: openstack/keystone  6abc002235bb6b6a041f454b42ca609b2dadfb53

V3 Extension class

There was no base class specific to V3 extensions. This adds a base
class for V3 extensions and also changes the current V3 extensions
to use it.

bp json-home

Change-Id: I9a65867ced1bc116e3395baf4abfa35796511788