removed another redundant white space at an EOL

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac352@3287 e5f2f494-b856-4b98-b285-d166d9295462

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

@@ -36,7 +36,7 @@ class ServeMixIn:
         self.__serve_thread = None
 
     def serve_forever(self, poll_interval=None):
-        ''' Override the serve_forever([poll_interval]) in class 
+        ''' Override the serve_forever([poll_interval]) in class
         socketserver.TCPServer by using the socketpair to wake up
         instead of pulling.
           Note, parameter 'poll_interval' is just used to keep the