Update LVM lockfile name identical to RAW and Qcow

Currently Raw and Qcow2 use filename as lock file identity
while LVM use whole path. This patch change the lockfile
name of LVM to identical to the others.
It will be helpful to allow driver layer code to remove
those files when the life cycle of an instance ends.

Related-Bug: #1256306

Change-Id: I07aa54032026ca479fe8de08308dae51527a6b13
Merge "Update LVM lockfile name identical to RAW and Qcow"