IB/iser: Add module version

Add displaying module version, update the version to 1.1,
and remove the DRV_DATE define.

Signed-off-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>