This reverts commit 5edc77a18c.
Reason for revert: Bug: #2019190
This revealed a bug in Cinder optimized migration code that can lead to data loss with RBD and potentially other drivers, by using the optimized migration path in more cases. Once the issues there are fixed, this should be re-introduced.
Depends-On: https://review.opendev.org/c/openstack/cinder/+/900671
Change-Id: I893105cbd270300be9ec48b3127e66022f739314
(cherry picked from commit 13196c700c)
(cherry picked from commit 8d453fa7b6)