fix method call to retrieve connection address

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@256 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/master/election.py

@@ -97,7 +97,7 @@ class ElectionEventHandler(MasterEventHandler):
                 # The peer is not a master node!
                 logging.error('%s:%d is not a master node', ip_address, port)
                 app.nm.remove(node)
-                app.negotiating_master_node_set.discard(node.getAddress())
+                app.negotiating_master_node_set.discard(node.getServer())
                 conn.close()
                 return
             if conn.getAddress() != (ip_address, port):