Completes the registration of the cinder volume storage endpoint.

The changes here are to aid in the registering of the cinder volume
service on the overcloud notcompute node.  This partially supports
the referenced blueprint.

blueprint tripleo-deploy-block-storage-services

Change-Id: I2c99d5feadf3c85451444251598d39430a8e0470
Merge "Completes the registration of the cinder volume storage endpoint."