message: Don't dump the subgraph fingerprint into info log
diff: @@ -176,7 +176,7 @@ Status RewriteSubgraph(const std::vector<OutputTensor>& arg_source_tensors,
  string serialized;
  TF_RET_CHECK(SerializeToStringDeterministic(gdef, &serialized));
  uint64 fingerprint = Fingerprint64(serialized);
  - LOG(INFO) << "Subgraph fingerprint:" << fingerprint;
  + VLOG(1) << "Subgraph fingerprint:" << fingerprint;
  call_def->set_op(absl::StrCat(call_def->op(), "_", fingerprint));
  return Status::OK();
  }
  