[IMP] purchase: use the new signal_xxx methods instead of trg_validate.

bzr revid: vmt@openerp.com-20130128091716-ni5zb1qp4sib58rm

addons/purchase/test/process/rfq2order2done.yml

@@ -62,8 +62,7 @@
     import netsvc
     invoice_ids = [x.id for x in self.browse(cr, uid, ref("purchase_order_1")).invoice_ids]
     wf_service = netsvc.LocalService("workflow")
-    for invoice in invoice_ids:
-      wf_service.trg_validate(uid, 'account.invoice', invoice, 'invoice_open', cr)
+    self.pool.get('account.invoice').signal_invoice_open(cr, uid, invoice_ids)
 -
   I check that purchase order is invoiced.
 -