Add root clients to RO volume from snapshot

[randeepdell]

Description

In Powerscale read only client privileges supersedes all privileges, hence adding to root-clients has no effect.
One of the customer would like to traverse files irrespective of owner permissions when RootClientEnabled is set to true.
Hence Read Only PVC created from snapshot is added only to root clients instead of read only clients when Root Client Enabled is set to true.

In the case of source PVC being in non-system access zone, when pvc from snapshot is created, the AzService IP to be supplied in the storage class in restore needs to be the isi endpoint and not the AzService IP of the access zone, as the snapshot is created in the System access zone and not the source access zone.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#362

Checklist:

• [x ] I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Built the code, created sc, pvc, pod, snapshot, pvc from snapshot and tested the same.

[prablr79]

@randeepsharma can you also share code coverage for this PR ?

[randeepdell]

@randeepsharma can you also share code coverage for this PR ?

coverage: 72.8% of statements