shorter timeout to shutdown rtkbase a little faster.

I still need to find why I can't catch sigint with signal.signal to stop the various thread

web_app/server.py

@@ -994,6 +994,7 @@ def arg_parse():
                     '%s:%s' % ('[::1]', args.port or rtkbaseconfig.get("main", "web_port", fallback=80)) ],
         'workers': 1,
         'worker_class': 'gevent',
+        'graceful_timeout': 10,
         'loglevel': 'debug' if args.debug else 'warning',
         }
         #start gunicorn