Added support of volume api_v3 client

* From rocky release projects are consuming the volume featured
  enabled v3 API, Since the earlier code has support
  for v1, v2 and since api_v3 is used in tempest.conf, it will give
  AttributeError: 'Manager' object has no attribute 'volumes_client'.
  The above patch fixes the issue.

* Keep cinder v1 api as tempest plugin is branchless, it would avoid
  breakage if someone is still consuming it.

Closes-Bug: #1775353
Related-Prod: PRODX-00001

Change-Id: Ia9d070a6033a8192112dbaa1704b1de6838051c5
2 files changed