Catch extra args in windows signal handler

gns3server/web/web_server.py

@@ -109,7 +109,7 @@ class WebServer:
 
     def _signal_handling(self):
 
-        def signal_handler(signame):
+        def signal_handler(signame, *args):
             log.warning("Server has got signal {}, exiting...".format(signame))
             asyncio.async(self.shutdown_server())