Add the ability to run the cinder-volume service in an active-active
configuration via a new CinderVolumeCluster parameter. The cinder-volume
service runs A/A only when configured with a cluster name.
Change-Id: Ic76742d3835d93bf16f5d9c13a2786fd7a373423
Depends-On: I615af64086d46356f322094d9f3b4e29557ed899