Comment 4 for bug 1790008

Reviewed: https://review.openstack.org/639749
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=5c1f6c0535aa73b482fc927be47c51d512f814ce
Submitter: Zuul
Branch: stable/rocky

commit 5c1f6c0535aa73b482fc927be47c51d512f814ce
Author: Vipin Balachandran <email address hidden>
Date: Thu Aug 30 14:38:16 2018 -0700

    VMware: Fix revert-to-snapshot

    Commit 46b8da35d79121df34ec9befd353c8c428be846b modified
    the method we use to query the backend volumes. But,
    revert-to-snapshot implementation which was in-progress
    when the above commit was merged missed that change.
    Fixing it by updating the query method call in
    revert_to_snapshot.

    Change-Id: I34cbd4420b43f52cd8d23833658f6386cb3e6437
    Closes-bug: #1790008
    (cherry picked from commit 258beef2649d79c24ddafaf2064e94557c316bde)