code: def all_status(self):
          
          laundry_rooms = {}
          for room in self.hall_to_link:
              laundry_rooms[room] = self.parse_a_hall(room)
  
          return laundry_rooms
docs: Return names, hall numbers, and the washers/dryers available for all
          rooms in the system
  
          >>> all_laundry = l.all_status()