1) Creating a snapshot:
$ manila snapshot-create share1 --name testshare1snapshot --wait
<CLI waits on the share snapshot to become available before providing snapshot details>
2) Deleting a snapshot:
$ manila snapshot-delete testshare1snapshot --wait
<CLI waits on the share snapshot to be deleted before returning to the prompt>
3) Reverting a share to its snapshot:
$ manila revert-to-snapshot testshare1snapshot --wait
Closes-Bug: #1898307
Change-Id: Ib248e48c53c4c6c5886f2693e3bc26a0848fff3a