[stale] Clean feature history#67

stevenvar wants to merge 16 commits intojoeyye-work:new-serving-2.20joeyye-work/tensorflow:new-serving-2.20from

stevenvar:steven.joey_for_serving_history_by_feature_cleanstevenvar/tensorflow:steven.joey_for_serving_history_by_feature_cleanCopy head branch name to clipboard