message: Disable dumping packets if logging is disabled
diff: @@ -22,6 +22,10 @@ pub fn dump_packet(
  pn: PacketNumber,
  payload: &[u8],
  ) {
  + if ::log::Level::Debug > ::log::max_level() {
  + return;
  + }
  +
  let mut s = String::from("");
  let mut d = Decoder::from(payload);
  while d.remaining() > 0 {
  