erp5_workflow_test_data: rename the user created testing workflows to avoid conflict in conversion live test.

WorkflowTool.py: add workflow_script reference in conversion codes; add a chains_by_type repair script related function.

erp5_workflow: change the name of an attribute in convertWorkflow script which cause the failure of converted workflow reassignment.

erp5_workflow: in convertWorkflow, getChainsByType method return a regenerated dict to avoid scurity issue.