[Storwize] Fix multiple SVC CLI calls for create volume operation

[Harsh Ailani]

During creation of GMCV type volume
there are multiple lsvdisk calls made for checking the existence
of source change volume, aux volume and change aux volume.
Along with these calls there is a lssystem call which can be
optimized.

Currently there are over 23 SVC CLI calls during GMCV create volume operation.

This patch optimizes these lsvdisk and lssystem calls which in
turn reduces the computational time for creating GMCV volumes.

[Harsh Ailani (haailani)]

Proposed the following code change:
https://review.opendev.org/c/openstack/cinder/+/829110

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/cinder/+/829110
Committed: https://opendev.org/openstack/cinder/commit/76de76646d6ed24f9bb3f2fed00e81746e9804a5
Submitter: "Zuul (22348)"
Branch: master

commit 76de76646d6ed24f9bb3f2fed00e81746e9804a5
Author: haailani <email address hidden>
Date: Thu Apr 21 10:51:57 2022 +0000

    [SVf]:Fix multiple lsvdisk calls for GMCV create volume operation

    [Spectrum Virtualize family] During creation of GMCV type volume
    there are multiple lsvdisk calls made for checking the existence
    of source change volume, aux volume and change aux volume.
    Along with these calls there is a lssystem call which can be
    optimized.

    This patch optimizes these lsvdisk and lssystem calls which in
    turn reduces the computational time for creating GMCV volumes.

    Closes-Bug: #1961548

    Change-Id: Id00cda88132184e66fbf6c03965f1de30cf02dcf

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 21.0.0.0rc1 release candidate.