Fix unit tests of ERP5 Product so that they don't call unsupported workflow methods. Transitions of the following workflows were not considered:
* amortisation_transaction_causality_workflow
* event_workflow
* processing_status_workflow
* publication_workflow

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27822 20353a03-c40f-0410-a6d1-a30d3c3de9de