Removed unused cinder and glance data mappings.

Expanded cinder and glance backend in data_mappings.
Delete cinder and glance backend in hiera_data.
Added new vars to user.common.yaml to support cephdeploy module changes.

Change-Id: I93625d25f9d3f5f764e964e67f15e8dd302332d3
Merge "Removed unused cinder and glance data mappings."