[oneoff] Script to push sgfs to bigtable eval_games (#776)
[oneoff] Script to push sgfs to bigtable eval_games (#776)

* [oneoff] Script to push sgfs to bigtable eval_games

* de-duplicate games

* real usage fixes

* Addressing comments from #797

tensorflow/minigo,tensorflow/minigo,tensorflow/minigo,tensorflow/minigo,tensorflow/minigo,tensorflow/minigo