Add Volume and Snapshot CinderCLI tests and fixtures.

* Adds CinderTestFixture
* Adds CinderCLI_Composite that combines cinder cli, client,
  behavior and config.
* Adds CinderVerticalIntegrationComposite that combines cinder
  api and cli clients, behaviors and configs.
* Adds volume-type based data-driven smoke tests:
    ddtest_create_volume
    ddtest_delete_volume_bu_id
    ddtest_create_snapshot

Change-Id: Id9133b8f59f270835499077071aefd538ec4c3e3
Merge "Add Volume and Snapshot CinderCLI tests and fixtures."