Move tensorboard_log_util to OSS pattern 2

Summary:
Pull Request resolved: https://github.com/facebookresearch/d2go/pull/257

WTTS

Reviewed By: wat3rBro

Differential Revision: D36438059

fbshipit-source-id: 010cfef86795dc65ed279124c1ed32206829fdaa

d2go/utils/tensorboard_log_util.py

@@ -6,6 +6,9 @@ import logging
 import os
 from functools import lru_cache
 
+from d2go.utils.oss_helper import fb_overwritable
 
+
+@fb_overwritable()
 def get_tensorboard_log_dir(output_dir):
     return output_dir