Update telnet_server.py

Maybe use the correct object name this time for the socket objects.

gns3server/utils/asyncio/telnet_server.py

@@ -192,9 +192,9 @@ class AsyncioTelnetServer:
         sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
         # 60 sec keep alives, close tcp session after 4 missed
         # Will keep a firewall from aging out telnet console.
-        writer_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 60)
-        writer_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 10)
-        writer_sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 4)
+        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 60)
+        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 10)
+        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 4)
         #log.debug("New connection from {}".format(sock.getpeername()))
 
         # Keep track of connected clients