Fix Dynamips VM ignores changed console port

Fix #468

gns3server/modules/dynamips/nodes/router.py

@@ -894,7 +894,7 @@ class Router(BaseVM):
         """
 
         self.console = console
-        yield from self._hypervisor.send('vm set_con_tcp_port "{name}" {console}'.format(name=self._name, console=console))
+        yield from self._hypervisor.send('vm set_con_tcp_port "{name}" {console}'.format(name=self._name, console=self.console))
 
     @asyncio.coroutine
     def set_aux(self, aux):