Move cinder store to use auth_token

The cinder store uses auth_tok. This should be
changed to use auth_token as the glance request
context is changing: https://review.openstack.org/#/c/131478/

Change-Id: Id8a920d7035de111ce3fde54d62f35a07a9a7851
Partial-bug: #1385213
Merge "Move cinder store to use auth_token"