Gracefull down of c++ standart version

Add stress-test shell script

src/server/server.cpp

@@ -129,7 +129,7 @@ void Server::handle_client(int client_socket, bool mode, int steps) {
         response = "вы проиграли\n";
         send(client_socket, response.c_str(), response.size(), 0);
     }
-
+    shutdown(client_socket, SHUT_RDWR);
     close(client_socket);
     std::cout << "Игрок " << player_name << " отключился" << std::endl;
 }
@@ -155,4 +155,5 @@ void Server::start(int steps, bool service_mode) {
         std::cout << "Новое соединение установлено" << std::endl;
         std::thread(&Server::handle_client, this, new_socket, service_mode, steps).detach();
     }
+    shutdown(server_socket, SHUT_RDWR);
 }