Forget cluster when reconnecting to primary master.

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@1212 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/admin/app.py

@@ -112,6 +112,7 @@ class Application(object):
 
         nm = self.nm
         nm.clear()
+        self.cluster_state = None
         for server in self.master_node_list:
             nm.add(MasterNode(server = server))