Add version for device_block_mapping_v2
Add version for device_block_mapping_v2

Change-Id: I797bb1de02408c6ecc4913eb8c6bb2bff5aae15f
Closes-Bug: #1444778

cryptickp/heat,dragorosson/heat,miguelgrinberg/heat,rh-s/heat,maestro-hybrid-cloud/heat,takeshineshiro/heat,gonzolino/heat,openstack/heat,pshchelo/heat,rh-s/heat,dims/heat,pratikmallya/heat,takeshineshiro/heat,dragorosson/heat,cwolferh/heat-scratch,pratikmallya/heat,openstack/heat,rdo-management/heat,jasondunsmore/heat,miguelgrinberg/heat,dims/heat,cryptickp/heat,jasondunsmore/heat,gonzolino/heat,cwolferh/heat-scratch,srznew/heat,pshchelo/heat,srznew/heat,maestro-hybrid-cloud/heat,rdo-management/heat,noironetworks/heat,steveb/heat,steveb/heat,noironetworks/heat