EthernetSwitch closing connections, Ref: gui/#2330

gns3server/utils/asyncio/telnet_server.py

@@ -209,6 +209,11 @@ class AsyncioTelnetServer:
             yield from connection.disconnected()
             del self._connections[network_writer]
 
+    @asyncio.coroutine
+    def close(self):
+        for writer, connection in self._connections.items():
+            connection.close()
+        
     @asyncio.coroutine
     def client_connected_hook(self):
         pass