message: fix(http2): send INTERNAL_ERROR when user's Service errors
diff: @@ -209,7 +209,12 @@ where
  }
  return Ok(Async::NotReady);
  }
  - Err(e) => return Err(::Error::new_user_service(e)),
  + Err(e) => {
  + let err = ::Error::new_user_service(e);
  + warn!("http2 service errored: {}", err);
  + self.reply.send_reset(Reason::INTERNAL_ERROR);
  + return Err(err);
  + },
  };
  let (head, mut body) = res.into_parts();
  