make the security uid generation working with many nodes, use the id_tool in order to generate new ids, so it is possible to have multiple nodes generating new security uids by the same time without errors

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16299 20353a03-c40f-0410-a6d1-a30d3c3de9de