Unfortunately, this requires to create ERP5 sites at the root.

The fixes the following test case:
  transaction.commit()
  repr(portal.__dict__['_components'])

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@40308 20353a03-c40f-0410-a6d1-a30d3c3de9de