Comment 4 for bug 1851371

Reviewed: https://review.opendev.org/698923
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=ad1b2d32a582d5099682d8d4a619042a975c2b71
Submitter: Zuul
Branch: stable/train

commit ad1b2d32a582d5099682d8d4a619042a975c2b71
Author: odonos12 <email address hidden>
Date: Thu Oct 3 16:31:11 2019 +0100

    PowerMax Driver - retype attached replication fix

    Fixes for retyping attached volumes when moving from
    non-replicated to replication enabled volume type.
    Cases fixed:
    -Retype to metro replication with existing pairs.
    -Retype to non-replicated after retyping to metro.
    -Retype to asynchronous replication with existing pairs present.
    -Delete attached volume with asynchronous replication after
    attaching to an instance.

    Change-Id: Ibbf04dedade6e85649ec702574ce51ce82fc8733
    Closes-Bug: #1851371
    (cherry picked from commit 49b941b83a3db3f9f561590887e174742f50cc2b)