Remove spaces at the EOL.

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac352@3300 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/python/isc/utils/serve_mixin.py

@@ -57,7 +57,7 @@ class ServeMixIn:
             else:
                 self._handle_request_noblock()
 
-        self.__is_shut_down.set()                
+        self.__is_shut_down.set()
 
     def shutdown(self):
         '''Stops the serve_forever loop.