add a new vehicle

def add_new_vehicle(self, hb):
        '''add a new vehicle'''
        if hb.type == mavutil.mavlink.MAV_TYPE_GCS:
            return
        sysid = hb.get_srcSystem()
        self.vehicle_list.append(sysid)
        self.vehicle_name_by_sysid[sysid] = self.vehicle_type_string(hb)
        self.update_vehicle_menu()