Execute discard command on block device that doesn't support it
should return success.
Returning internal error while using multi-path fails the path.
Reviewed-by: NMax Gurtovoy <maxg@mellanox.com>
Signed-off-by: NIsrael Rukshin <israelr@mellanox.com>
Signed-off-by: NSagi Grimberg <sagi@grimberg.me>