Updating Get Volume Driver Capabilities Spec
Updating Get Volume Driver Capabilities Spec

This has less emphasis on Horizon and more what it'll bring Cinder. As
a side effect, this will allow clients like Cinder client and Horizon to
consume the interface to allow operators to have a better user
experience.

Change-Id: I927650d9af7ebf9523a08033d45cf5a8895555f9

openstack/cinder-specs