Test capabilites for srbac feature

Changed the test to keep convention without abstract methods
Also remvoed base.BaseVolumeTest inheritance, to isolate RBAC tests from
the normal tests while they are developed, even though this could be
revisited in the future the base classes for API tests in
cinder-tempest-plugin could be unified.

Change-Id: I7020487fcdb0a8e34be92a2b0f110b885cbeb339
Signed-off-by: Yosi Ben Shimon <ybenshim@redhat.com>
2 files changed