methods.
Prior to that change, catalog search was returning too many preferences and a
wrong result was sometimes cached.
Also mark test_system_preference_value_prefererred_clear_cache_disabled
@expectedFailure


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41415 20353a03-c40f-0410-a6d1-a30d3c3de9de