
Block Storage API v2 support is being removed from the cinderclient during the Xena development cycle [0], so add a check to determine whether the available cinderclient has v2 support. [0] https://wiki.openstack.org/wiki/CinderXenaPTGSummary#Removing_the_Block_Storage_API_v2 Change-Id: Id54da1704d94526071f500c36a6e38d6d84aa7b8