Glance charm allows to store images in file, ceph, swift.
This changeset adds support for storage of images in Cinder
for OpenStack Mitaka or later.
Required dependencies are installed on relation to Cinder
(inline with Ceph integration).
This feature is dependent on resolution of some packaging
issues in the glance-store package (see Related-Bug).
Related-Bug: 1609733
Change-Id: Ib9d9f28e040b7b2eebb3f5d0ee9ff0773292bdcc
fa1c1dda1c