Move cinder store to use auth_token
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

saeki-masaki/glance_store,jamielennox/glance_store,hmakkapati/glance_store,openstack/glance_store,jamielennox/glance_store,cpallares/glance_store,saeki-masaki/glance_store,cpallares/glance_store,openstack/glance_store,redhat-openstack/glance_store,redhat-openstack/glance_store,hmakkapati/glance_store