Remove redundant notification
Remove redundant notification

The "revert.end" message is notified twice which is redundant.
One is in _revert_to_snapshot. The other is in revert_to_snapshot.

Remove the redundant one.

Change-Id: I5e3d4403ddc82b93cfc4bfb5c4c04913929e6a43

Datera/cinder,openstack/cinder,mahak/cinder,phenoxim/cinder,Datera/cinder,openstack/cinder,eharney/cinder,j-griffith/cinder,mahak/cinder,phenoxim/cinder,j-griffith/cinder,eharney/cinder