code: def linkify(self, commands, notificationways):
          
          self.linkify_with_notificationways(notificationways)
          self.linkify_command_list_with_commands(commands, 'service_notification_commands')
          self.linkify_command_list_with_commands(commands, 'host_notification_commands')
docs: Create link between objects::
  
           * contacts -> notificationways
  
          :param notificationways: notificationways to link
          :type notificationways: alignak.objects.notificationway.Notificationways
          :return: None
          TODO: Clean this function