Goal: 

• Merge upstream patches

Acceptance Criteria:

• https://review.opendev.org/c/openstack/manila/+/952736  Dell PowerScale: Rename Isilon to PowerScale in Manila Driver
• https://review.opendev.org/c/openstack/manila/+/947255 Dell PowerScale: Added support of thin provisioning
• https://review.opendev.org/c/openstack/manila/+/955856 Dell PowerScale: add support for ensure shares
• https://review.opendev.org/c/openstack/manila/+/955853 Dell PowerScale: add support for update share stats
• https://review.opendev.org/c/openstack/manila/+/943233 Dell PowerScale: Http auth issue, SSL verification error and etc.