Deprecate sort_method parameter in DomainTool.searchPredicateList since cmp...

Deprecate sort_method parameter in DomainTool.searchPredicateList since cmp parameter in sorting methods is slow and deprecated.
Add new sort_key_method parameter that is passed as key parameter to list.sort.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26242 20353a03-c40f-0410-a6d1-a30d3c3de9de