Dell SC: cgsnapshot-delete doesn't actually delete
dell_storagecenter_api.py was looking for the cgsnapshot for
cgsnapshot-delete via the wrong REST API call. It was also only
looking for the first volume's snapshot rather than all snapshots
associated with a cgsnapshot. It now locates the snapshots properly
and expires the associated replays on cgsnapshot-delete.
Tests updated appropriately.
Change-Id: I1e635db8b06d3d7a78573e6e8a2a4c25b7fb458d
Closes-Bug: #
1500583
(cherry picked from commit
e529e4d6cc71003c53126612dd869fa6fb23493a)