Add volume encryption metadata to cinderclient

This modification adds support for volume type encryption to
python-cinderclient, supporting two Cinder API extensions.

The first support set provides accessors to python-cinderclient for
retrieving volume encryption metadata from Cinder. These changes
provide other services (e.g., Nova) access to encryption
metadata (e.g., encryption key UUIDs). See the volume encryption
key API extension in Cinder for more information.

The second support set creates a new python-cinderclient resource
manager, along with matching shell commands, that provides creation
and accessor operations for encryption type information. These
operations allow users and services to define encryption information
(e.g., cipher, key size, encryption provider) for a pre-existing
volume type. See the volume type encryption API extension in Cinder
for more information.

blueprint encrypt-cinder-volumes

Change-Id: Id4b2425d699678eb1997863362ddb9bf5ba6f033
Merge "Add volume encryption metadata to cinderclient"