mgr/volumes: Use snapshot root directory attrs when creating clone root

mgr/volumes: Use snapshot root directory attrs when creating clone root

If a subvolumes mode or uid/gid values are changed post a snapshot,
and a clone of a snapshot prior to the change is initiated, the clone
inherits the current source subvolumes attributes, rather than the
snapshots attributes.

Fixing this by using the snapshots subvolume root attributes to create
the clone subvolumes root.

Following attributes are picked from the source subvolume snapshot:
- uid, gid, mode, data pool, pool namespace, quota

Fixes: https://tracker.ceph.com/issues/46163
Signed-off-by: Shyamsundar Ranganathan <srangana@redhat.com>