Method GetAndClear

test/icinga-checkresult.cpp:832–838

	struct NotificationLog {
		std::vector<std::pair<NotificationType, ServiceState>> GetAndClear() {
			std::lock_guard<std::mutex> lock (mutex);

			std::vector<std::pair<NotificationType, ServiceState>> ret;
			std::swap(ret, log);
			return ret;
		}

		void Add(std::pair<NotificationType, ServiceState> notification) {
			std::lock_guard<std::mutex> lock (mutex);