Minor tweak to debug logging

Change-Id: Ic5ab1c577da813a6a7106cbe6711d9bd43f35f0f
diff --git a/drivers/NetgearXSM.py b/drivers/NetgearXSM.py
index dbe86b2..5c1367c 100644
--- a/drivers/NetgearXSM.py
+++ b/drivers/NetgearXSM.py
@@ -200,7 +200,7 @@
 
     # Set the mode of a port: access or trunk
     def port_set_mode(self, port, mode):
-        logging.debug("Setting port %s to %s", port, mode)
+        logging.debug("Setting port %s to %s mode", port, mode)
         if not self._is_port_mode_valid(mode):
             raise InputError("Port mode %s is not allowed" % mode)
         if not self._is_port_name_valid(port):