No auth_plugin support after removing RAX_AUTH

[Cory Stone]

Cinderclient post 1.0.7 doesn't work with Rackspace auth.

When fixing, https://bugs.launchpad.net/python-novaclient/+bug/966329, the CINDER_RAX_AUTH flag was taken out, but cinderclient was not updated to support auth_plugins like novaclient.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/73703

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/73703
Committed: https://git.openstack.org/cgit/openstack/python-cinderclient/commit/?id=d5334aa929beb4190ae04fddc98e693df142b9bd
Submitter: Jenkins
Branch: master

commit d5334aa929beb4190ae04fddc98e693df142b9bd
Author: Cory Stone <email address hidden>
Date: Fri Feb 14 13:42:58 2014 -0600

    Add auth_plugin support to cinderclient

    With CINDER_RAX_AUTH being rightfully removed, cinderclient is no longer
    compatible with Rackspace/any non-keystone auth. To fix this, I stole
    auth_system/auth_plugin from novaclient's implementation.

    See https://review.openstack.org/#/c/23820/.

    Change-Id: If5f84003f868ef02bb7eb7da67cf62018602e8f0
    Closes-Bug: 1280393