LU-1757 brw: added OBD short io connect flag

LU-1757 brw: added OBD short io connect flag

To prevent collisions with any future flags needed in features written
against this branch.

Signed-off-by: Alexander Boyko <alexander_boyko@xyratex.com>
Change-Id: I567020c24ab64c4faeed159ef8c6814e74f73503
Reviewed-on: http://review.whamcloud.com/3891
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>