message: errors: Avoid stripping error details when convering POSIX errors to Status
  This change is made out of a desire to have additional information be reported
  when there are filesystem errors (for e.g. see
diff: @@ -171,11 +171,7 @@ error::Code ErrnoToCode(int err_number) {
  Status IOError(const string& context, int err_number) {
  auto code = ErrnoToCode(err_number);
  - if (code == error::UNKNOWN) {
  return Status(code, strings::StrCat(context, "; ", strerror(err_number)));
  - } else {
  - return Status(code, context);
  - }
  }
  } // namespace tensorflow
  