Add _create_volume to ThinLVMVolumeDriver

Previously, _create_volume from LVMISCSIDriver would be called
when the volume manager calls create_volume_from_snapshot.

Fixes bug: 1192601

(cherry picked from commit 79a402d07502ac34bc0ec485b21b0be50ba807a7)

Conflicts:
	cinder/volume/drivers/lvm.py

Change-Id: I5cca287e8204c4647a5f09df961d9a76d0b38c42