Add missing setUnknown() on node class.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1546 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/node.py

@@ -109,6 +109,9 @@ class Node(object):
     def setRunning(self):
         self.setState(NodeStates.RUNNING)
 
+    def setUnknown(self):
+        self.setState(NodeStates.UNKNOWN)
+
     def setTemporarilyDown(self):
         self.setState(NodeStates.TEMPORARILY_DOWN)