update tests that were not passing

The logic has been changed without updating the tests, and we didn't
notice because of OCA/maintainer-quality-tools#148.
Merge pull request #85 from lepistone/fix-tests-agreement-sourcing

update tests that were not passing
Set picking type on PO generated from sourcing with FA
This bridge with onchanges on purchase_delivery_address
and make it consistant with purchase_requisition_delivery_address