Add missing helper method.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1537 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/node.py

@@ -88,6 +88,9 @@ class Node(object):
     def isRunning(self):
         return self._state == NodeStates.RUNNING
 
+    def isUnknown(self):
+        return self._state == NodeStates.UNKNOWN
+
     def isTemporarilyDown(self):
         return self._state == NodeStates.TEMPORARILY_DOWN