Add a new Node state: UNKNOWN_STATE. In this state, nodes are supposed to be RUNNING, but there was no successful attemp to connect to them yet, nor any notification that they were running. This is especially useful in tests to avoid a stopped node to appear as RUNNING until receiving a notification that it is in fact DOWN.


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@1192 71dcc9de-d417-0410-9af5-da40c76e7ee4