Snapshot delete/prune tests were only working because the delete command
would report success even when deleting a snapshot that didn't exist,
and the test regex was finding the snapshot name multiple times in
the list output and deleting it twice.

Snapshot restore tests seem to have expected the deployment to be rolled out
immediately, which is not a reasonable expectation.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
(cherry picked from commit 7c5b69ca)
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>