[FIX] mrp: log activity on parent MO

Usecase:
- Set table top as manufacture and MTO
- Create a MO for table(MTO)
- Confirm the MO
- Cancel the MO

The activity with the exception is not logged on the child MO

It happens because the _get_upstream_documents_and_responsible for move
linked to a MO is based on the created_production_id field. However it
is only set on the move that created the move_finished_ids for the new
MO. In the case of a MO that directly create a child MO the chain is:

MO -> move_raw_ids -> move_finished_ids -> MO2
The log_activity on cancel is based on the move_raw_ids and their
move_orig_ids in the previous case it's the move_finished_ids for MO2.
However the move_finished_ids for MO2 is directly link to the child MO
and the created_production_id is set on the move_raw_ids for MO parent.

Compare to PO, we could directly base the parent document on production_id
since the move_finished_ids are directly created.

addons/mrp/models/stock_move.py

@@ -216,8 +216,8 @@ class StockMove(models.Model):
         return self.env['stock.move']
 
     def _get_upstream_documents_and_responsibles(self, visited):
-            if self.created_production_id and self.created_production_id.state not in ('done', 'cancel'):
-                return [(self.created_production_id, self.created_production_id.user_id, visited)]
+            if self.production_id and self.production_id.state not in ('done', 'cancel'):
+                return [(self.production_id, self.production_id.user_id, visited)]
             else:
                 return super(StockMove, self)._get_upstream_documents_and_responsibles(visited)