Cleanup

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/branches/0.7@3146 b32b6428-25c9-4566-ad07-03861ab6144f

libs/lib/xaal/lib/aionetwork.py

 import asyncio
 import struct
 import socket
-from enum import Enum
 
 import logging
 
@@ -55,7 +54,7 @@ class XAALServerProtocol(asyncio.Protocol):
         self.on_dtg_recv = on_dtg_recv
         
     def connection_made(self, transport):
-        logger.info(f"xAAL network connected")
+        logger.info("xAAL network connected")
         self.transport = transport
 
     def error_received(self, exc):