fixtures: Add legacy APIs to cinder fixture
fixtures: Add legacy APIs to cinder fixture

A TODO is left to wire these up correctly within the fixture, for the
time being we just need to ensure the methods within
nova.volume.cinder.API are mocked.

Change-Id: I2152fd63f61cfa84faef90ce24880f03fb391eee

openstack/nova,mahak/nova,mahak/nova,mahak/nova,openstack/nova,openstack/nova