[Kraken] fix midnight in vehicle_positions api
[Kraken] fix midnight in vehicle_positions api

xlqian/navitia,Tisseo/navitia,xlqian/navitia,xlqian/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,Tisseo/navitia,CanalTP/navitia,Tisseo/navitia,CanalTP/navitia,xlqian/navitia,CanalTP/navitia,CanalTP/navitia,Tisseo/navitia