Fix S3 integration test.
Fix S3 integration test.

alexdebrie/pachyderm,sambooo/pachyderm,ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,klucar/pachyderm,henrylee2cn/pachyderm,phacops/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,sambooo/pachyderm,henrylee2cn/pachyderm,phacops/pachyderm,wideioltd/pachyderm,kunthar/pachyderm,pachyderm/pfs,ShengjieLuo/pachyderm,alexdebrie/pachyderm,kunthar/pachyderm,sambooo/pachyderm,pachyderm/pfs,wideioltd/pachyderm,pachyderm/pfs,klucar/pachyderm