Pass newly created router to _update_router_gw_info
Pass newly created router to _update_router_gw_info

pass it to _update_router_gw_info as last parameter to save
retrieving it again from the session.

Change-Id: I7fbbd675839c2874578c62dfed390d86e3b4801a

gkotton/vmware-nsx,gkotton/vmware-nsx