[Storwize] Fix multiple SVC CLI calls for rc-relationship operations

[Harsh Ailani]

There are several svcinfo calls such as lsvdisk and lsrcrelationship calls which are not necessary in several operations such as extend volume operation or convert global mirror volume to gmcv.

Relationship information is already fetched in these operations and can the same info can be used in the calls such as :
start_relationship
stop_relationship
change_relationship_changevolume
change_relationship_cycleperiod
change_relationship_cyclingmode
delete_relationship

Reducing these calls will optimize the code and reduce the load on storage. Using the stored data can reduce the compute time also.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/cinder/+/844140

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 23.0.0.0rc1 release candidate.