[FIX] mrp: UoM of quantity available

The field `quantity_available` can be computed in two different ways:
- equal to `product_uom_qty`
- equal to `reserved_availability`

However, `product_uom_qty` is in the UoM of the move, while
`reserved_availability` is in the UoM of the product.

We convert into the UoM of the move, because `quantity_available` is
supposed to be in the same UoM than `product_uom_qty` ("To Consume").

opw-704775

addons/mrp/models/stock_move.py

@@ -88,7 +88,7 @@ class StockMove(models.Model):
             if move.state == 'assigned':
                 move.quantity_available = move.product_uom_qty
             else:
-                move.quantity_available = move.reserved_availability
+                move.quantity_available = move.product_id.uom_id._compute_quantity(move.reserved_availability, move.product_uom)
 
     @api.multi
     @api.depends('move_lot_ids', 'move_lot_ids.quantity_done', 'quantity_done_store')