The /identity_admin endpoint is the port 80/443 equivalent of the
service that typically runs on port 35357. In v2 some operations must be
performed on the admin endpoint whereas on v3 the services on 5000 and
35357 are exactly the same. This would be why the service was mounted at
/identity_v2_admin however that is misleading because both the v2 and v3
services are present on that endpoint.
This is particularly confusing because we set this as the OS_AUTH_URL
endpoint and it makes it seem like we are doing v2 authentication when
we are not.
Change-Id: If73735026079fb19ca5bd44b3a4dc1f507b5c99d
04e69de6c5