message: Put WARNING log in handshakeConfirmed behind version check
  Summary: in draft-24, we do not drop handshake key, which means we keep triggering this warning log over and over
diff: @@ -99,7 +99,8 @@ void ClientHandshake::doHandshake(
  }
  void ClientHandshake::handshakeConfirmed() {
  - if (phase_ != Phase::OneRttKeysDerived) {
  + if (phase_ != Phase::OneRttKeysDerived &&
  + *conn_->version != QuicVersion::MVFST_D24) {
  if (phase_ == Phase::Established) {
  LOG(WARNING) << "Handshake was already established";
  } else {
  