MRP-1342 mgs: add missing mask

MRP-1306 removes MGS_CONNECT_SUPPORT mask for connect flags
by mistake. This patch adds mask.

Signed-off-by: Alexander Boyko <alexander_boyko@xyratex.com>
Change-Id: I8d6192d4de340aadf3e42f52f714146d1295d78c
Reviewed-on: http://morpheus.xyus.xyratex.com:8443/gerrit/667
Tested-by: Jenkins
Reviewed-by: Alexey Lyashkov <Alexey_Lyashkov@xyratex.com>
Tested-by: Alexander Lezhoev <Alexander_Lezhoev@xyratex.com>
Reviewed-by: Andriy Skulysh <Andriy_Skulysh@xyratex.com>
Reviewed-by: Vitaly Fertman <Vitaly_Fertman@xyratex.com>