message: Fix gcc compile virtual overload warning.
diff: @@ -29,16 +29,19 @@ using testing::Return;
  namespace Envoy {
  namespace Server {
  -class MockServerLifecycleNotifier2 : public MockServerLifecycleNotifier {
  +class MockServerLifecycleNotifier2 : public ServerLifecycleNotifier {
  public:
  MockServerLifecycleNotifier2() = default;
  ~MockServerLifecycleNotifier2() override = default;
  +
  ServerLifecycleNotifier::HandlePtr
  registerCallback(Stage stage, StageCallbackWithCompletion callback) override {
  return registerCallback2(stage, callback);
  }
  - MOCK_METHOD2(registerCallback2, HandlePtr(Stage stage, StageCallbackWithCompletion callback));
  + MOCK_METHOD(ServerLifecycleNotifier::HandlePtr, registerCallback, (Stage, StageCallback));
  + MOCK_METHOD(ServerLifecycleNotifier::HandlePtr, registerCallback2,
  + (Stage stage, StageCallbackWithCompletion callback));
  };
  } // namespace Server
  