Create new logging files for workers to redirect its output.

def new_worker_redirected_log_file(self, worker_id):
        """Create new logging files for workers to redirect its output."""
        worker_stdout_file, worker_stderr_file = (self.new_log_files(
            "worker-" + ray.utils.binary_to_hex(worker_id), True))
        return worker_stdout_file, worker_stderr_file