ERP5Type/Base: execute workflow interactions in alphabetic order

With a perfect configuration, this should probably does not matter,
because the order of interactions should not be important (if there
are dependencies they should be handled more explicitly), but this
makes the behavior deterministic.

product/ERP5Type/Base.py

@@ -222,7 +222,7 @@ class WorkflowMethod(Method):
     # Otherwise, an exception is raised if the workflow transition does not
     # exist from the current state, or if the guard rejects it.
     valid_transition_item_list = []
-    for wf_id, transition_list in candidate_transition_item_list:
+    for wf_id, transition_list in sorted(candidate_transition_item_list):
       candidate_workflow = wf[wf_id]
       valid_list = []
       state = candidate_workflow._getWorkflowStateOf(instance, id_only=0)