Adding Missing rbac test for Volume

This PS adds 'update_snapshot_status' test for policy[0]

[0]https://github.com/openstack/cinder/blob/0cf910d4345c000e8c306b1cb2b2dd291975cf71/cinder/policies/snapshot_actions.py#L37

Change-Id: I0237500328bd360482177845de3e7b05c8d175b2
1 file changed