On 3par backend for cloned volume, the comment column is empty

[Raghavendra Tilay]

When volume is created via OpenStack ...
on 3par backend, some info (display_name, volume_type, etc) is populated in Comment column.

However for cloned volume, this info is missing i.e comment column is empty.

Given below is sample output from 3par backend:
Id 52 is new volume.
Id 57 is cloned volume.

sT0XR cli% showvv -showcols Id,Name,Prov,Comment osv*
Id Name Prov Comment
52 osv-5J7CVIflSkuLATghfcgrRg tpvv {"display_name": "vol_15", "volume_type_name": "primera_140", ...}
57 osv-EUKCiw5rTSCediK4dYiosg tpvv ---

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/cinder/+/916063