On Zope 2.12, in test files with multiple test classes, activities from one test class are reactivated on the next test class.

This doesn't happen on Zope 2.8 by pure accident: during portal construction, the skin is not properly configured, and so
activities are not reactivated as they are on Zope 2.12.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31320 20353a03-c40f-0410-a6d1-a30d3c3de9de