Updated openstack/openstack
Project: openstack/keystone  59e01e589c4ae3143776c9c48eaece97a4ea43ec

update example with a status code we actually use

Keystone doesn't return HTTP 203 today, so the example is a bit
misleading. HTTP 204 is something we use on assignment operations, for
example.

Change-Id: I874c02ae44f4d49848c49451c40005c7f1e33865