Using snakebite getmerge to implement this.
        :param path: HDFS directory
        :param local_destination: path on the system running Luigi
        :return: merge of the directory

def get_merge(self, path, local_destination):
        """
        Using snakebite getmerge to implement this.
        :param path: HDFS directory
        :param local_destination: path on the system running Luigi
        :return: merge of the directory
        """
        return list(self.get_bite().getmerge(path=path, dst=local_destination))