diablo style responses to auth_token

[Jesse Andrews]

We have coverage for essex-style auth responses in the auth_token middleware:

   https://review.openstack.org/#change,5203

The middleware seems to support diablo style responses. We should update the comments about our supported responses:

https://github.com/openstack/keystone/blob/master/keystone/middleware/auth_token.py

        # FIXME(ja): I think we are checking in both places because:
        # tenant might not be returned, and there was a pre-release
        # that put tenant objects inside the user object?
        try:
            tenant_id = token['tenant']['id']
            tenant_name = token['tenant']['name']
        except:
            tenant_id = user.get('tenantId')
            tenant_name = user.get('tenantName')

And ensure test coverage

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/5278

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/5278
Committed: http://github.com/openstack/keystone/commit/73af033ded8fe9ba54c37ab4f2a7553b3be1e450
Submitter: Jenkins
Branch: master

commit 73af033ded8fe9ba54c37ab4f2a7553b3be1e450
Author: Dolph Mathews <email address hidden>
Date: Tue Mar 13 12:27:53 2012 -0500

    Improved legacy tenancy resolution (bug 951933)

    Change-Id: Ia6fd5eb57e8d7f90328117351f7b814b1b4495dc