Adding support to revert a volume to a snapshot in Infinidat driver.
This patch implements:
- revert_to_snapshot()
- snapshot_revert_use_temp_snapshot()
Implements: blueprint infinidat-add-snapshot-revert
Change-Id: I7d3e639b896604a09c4e8a9fc24ab8aff1f65622
Signed-off-by: Alexander Deiter <adeiter@infinidat.com>