Emit a log statement when the task is submitted.

def apply_async(self, args=None, kwargs=None, **options):  # pylint: disable=arguments-differ
        """
        Emit a log statement when the task is submitted.
        """
        result = super(LoggedTask, self).apply_async(args=args, kwargs=kwargs, **options)
        log.info('Task {}[{}] submitted with arguments {}, {}'.format(
            self.name,
            result.id,
            args,
            kwargs
        ))
        return result