Method addStopCallback

fdbrpc/FlowTests.actor.cpp:258–261

	double timer_monotonic() override { return baseNetwork->timer_monotonic(); }
	void stop() override { return baseNetwork->stop(); }
	void addStopCallback(std::function<void()> fn) override {
		ASSERT(false);
		return;
	}
	bool isSimulated() const override { return baseNetwork->isSimulated(); }
	void onMainThread(Promise<Void>&& signal, TaskPriority taskID) override {
		return baseNetwork->onMainThread(std::move(signal), taskID);