the reservation should reserve a quant

For weird reasons, force-assigning a move does not associate quants.
action_assign'ing the picking does, and is the same procedure that you
can do via the interface.

stock_reserve/model/stock_reserve.py

@@ -125,7 +125,7 @@ class StockReservation(models.Model):
         move_recs = self.move_id
         move_recs.date_expected = fields.Datetime.now()
         move_recs.action_confirm()
-        move_recs.force_assign()
+        move_recs.picking_id.action_assign()
         return True
 
     @api.multi

stock_reserve/test/stock_reserve.yml

@@ -62,6 +62,14 @@
 -
   !python {model: stock.reservation}: |
     self.reserve(cr, uid, [ref('reserv_sorbet2')], context=context)
+-
+  Then the reservation should be assigned and have reserved a quant
+-
+  !python {model: stock.reservation, id: reserv_sorbet2}: |
+    from nose.tools import *
+
+    assert_equal('assigned', self.state)
+    assert_equal(1, len(self.reserved_quant_ids))
 -
   I check Virtual stock of Sorbet after update reservation
 -