Hence, don't add non-running nodes to unconnected_master_node_set before each election attempt.
Preserve negotiating_master_node_set between attemps to reuse possibly pending connections.


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@1183 71dcc9de-d417-0410-9af5-da40c76e7ee4