[EchoServer] Log if 'quit' was received

apps/EchoServer.cpp

@@ -63,6 +63,7 @@ auto main(int argc, char* argv[]) -> int {
 
 			if (unlikely(bytes_recv == 5 && strncmp("quit\n", buf, bytes_recv) == 0)) {
 				quit = true;
+				std::cout << "Echoserver received 'quit' command from client" << std::endl;
 				Runtime::getRuntime()->initiateTermination();
 				break;
 			}