Fix signature of _create_volume() in ThinLVMVolumeDriver

create_volume_from_snapshot will call _create_volume() with the
wrong parameters when using ThinLVMVolumeDriver.  It should be
compatible with LVMVolumeDriver's _create_volume() method.

Fixes bug: 1210853

Conflicts:
	cinder/volume/drivers/lvm.py

(cherry picked from commit 7323d8751538e06bb2dba106ba394bc6e29b8b84)
Change-Id: I18f7baf60601b3bcf01425b505a0579a826f072e