message: Allow listing an bucket for S3 Filesystem backend.
diff: @@ -398,7 +398,7 @@ Status S3FileSystem::FileExists(const string& fname) {
  Status S3FileSystem::GetChildren(const string& dir,
  std::vector<string>* result) {
  string bucket, prefix;
  - TF_RETURN_IF_ERROR(ParseS3Path(dir, false, &bucket, &prefix));
  + TF_RETURN_IF_ERROR(ParseS3Path(dir, true, &bucket, &prefix));
  if (prefix.back() != '/') {
  prefix.push_back('/');
  