Use an ERP5 user instead of a ZODB user, so that the test does not need to use global roles. Add a test to check strict security in simulation (which may not work at the moment).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18323 20353a03-c40f-0410-a6d1-a30d3c3de9de