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: I5a39a6ce1527810383dcd3845e6aa7715029b8de
Reviewed-on: http://morpheus.xyus.xyratex.com:8443/gerrit/666
Tested-by: Jenkins
Tested-by: Alexander Lezhoev <Alexander_Lezhoev@xyratex.com>
Reviewed-by: Andriy Skulysh <Andriy_Skulysh@xyratex.com>
Reviewed-by: Denis Kondratenko <Denis_Kondratenko@xyratex.com>