Parallelize ListFile and fix shard logic.
Parallelize ListFile and fix shard logic.

klucar/pachyderm,ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,ShengjieLuo/pachyderm