No more need to set cost price on move

issue5017
review20441003

sale.py

@@ -104,6 +104,5 @@ class SaleLine:
             move = self.get_move('out')
             if move is not None:
                 move.from_location = self.sale.drop_location
-                move.cost_price = move.unit_price
                 moves.append(move)
         return moves

tests/scenario_sale_supply_drop_shipment.rst

@@ -194,8 +194,6 @@ Receiving only 100 products::
 
     >>> config.user = stock_user.id
     >>> move, = shipment.supplier_moves
-    >>> move.unit_price == move.cost_price
-    True
     >>> move.quantity = 100
     >>> shipment.click('ship')
     >>> config.user = sale_user.id
@@ -224,13 +222,9 @@ The purchase is now waiting for his new drop shipment::
     >>> move, = shipment.customer_moves
     >>> move.quantity
     150.0
-    >>> move.unit_price == move.cost_price
-    True
     >>> move, = shipment.supplier_moves
     >>> move.quantity
     150.0
-    >>> move.unit_price == move.cost_price
-    True
 
 Let's cancel the shipment and handle the issue on the purchase.
 As a consequence the sale order is now in exception::