message: Get rid of mock clock in the echo server
  Summary: No reason to have this as a mock, and this causes spam.
diff: @@ -69,7 +69,9 @@ class EchoServer {
  server_(QuicServer::createQuicServer()) {
  server_->setQuicServerTransportFactory(
  std::make_unique<EchoServerTransportFactory>(prEnabled_));
  - server_->setFizzContext(quic::test::createServerCtx());
  + auto serverCtx = quic::test::createServerCtx();
  + serverCtx->setClock(std::make_shared<fizz::SystemClock>());
  + server_->setFizzContext(serverCtx);
  if (prEnabled_) {
  TransportSettings settings;
  settings.partialReliabilityEnabled = true;
  