[Storwize] Fix issue while extending a volume with replication enabled

[Venkata krishna Thumu]

Current IBM SVF Storwize driver extending a volume with replication enabled by deleting and recreating the Remote-copy relationship which leads to some critical problems such as data-sync between primary and secondary volumes and relationship recreation issues might be making the volume unavailable to the user.

Through this patch, we are fixing the former issues by stopping and starting the relationship instead of breaking the relationship and handling the exceptions for the negative scenarios such as extending a thick provisioned mirror volume and extending a mirror volume that is a part of a group.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/cinder/+/784140
Committed: https://opendev.org/openstack/cinder/commit/bdcee852321ee414d79da8a0ed9bd95f3369bd9d
Submitter: "Zuul (22348)"
Branch: master

commit bdcee852321ee414d79da8a0ed9bd95f3369bd9d
Author: venkatakrishnathumu <email address hidden>
Date: Wed Mar 31 17:13:44 2021 +0000

    [SVF] Fix extend issue for mirroring volumes

    [Spectrum Virtualize Family] Fixed volume extend issue for volumes
    with replication enabled by avoiding both delete RC relationship
    and create RC relationship of that volume.

    Closes-Bug: #1920870

    Change-Id: Id8dfa3d756142a17a50edf969d2ec84cfe524f4f

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 19.0.0.0rc1 release candidate.