Add support for Cinder v2 API

The Cinder v1 API is being deprecated. In addition it would be great to
provide new feature support in Cinder, caching and filtering for Nova to
take advantage of.

blueprint support-cinderclient-v2
Change-Id: I3193e5ff6a792c646b0333b7f56582186fb22e80
Merge "Add support for Cinder v2 API"