Create volume group when use the LVMISCSIDriver

Create volume group when set volume_driver to
cinder.volume.drivers.lvm.LVMISCSIDriver otherwise we can not create
volume with cinder.

Change-Id: I9d27a19254aa62130c13171d68c0c67e4e3686ce
Merge "Create volume group when use the LVMISCSIDriver"