[FIX] mrp: Handle kit with BoM having qty != 1

Use case:
- Create a Kit BoM with finished qty to 5 consuming 10 components
- Do a sale order for 3 units (3/5 of BoM)
- Update the sale order line to 4 units

Current behavior:
The delivery has a huge amount to deliver

Expected:
The delivery is for 8 units

It happens because the method `_compute_kit_quantities`
always expect a BoM for 1 units.
`bom_line_data['original_qty']` always contains the number of times the
BoM will be needed and not the quantity of finished products.
In order to have the number of component by unit of finished product we
have to introduce the BoM quantity in the formula

closes odoo/odoo#160149

Signed-off-by: Arnold Moyaux (arm) <arm@odoo.com>

addons/mrp/models/stock_move.py

@@ -545,6 +545,7 @@ class StockMove(models.Model):
         :return: The quantity delivered or received
         """
         qty_ratios = []
+        kit_qty = kit_qty / kit_bom.product_qty
         boms, bom_sub_lines = kit_bom.explode(product_id, kit_qty)
         for bom_line, bom_line_data in bom_sub_lines:
             # skip service since we never deliver them
@@ -559,8 +560,8 @@ class StockMove(models.Model):
                 # We compute the quantities needed of each components to make one kit.
                 # Then, we collect every relevant moves related to a specific component
                 # to know how many are considered delivered.
-                uom_qty_per_kit = bom_line_data['qty'] / bom_line_data['original_qty']
-                qty_per_kit = bom_line.product_uom_id._compute_quantity(uom_qty_per_kit, bom_line.product_id.uom_id, round=False)
+                uom_qty_per_kit = bom_line_data['qty'] / (bom_line_data['original_qty'])
+                qty_per_kit = bom_line.product_uom_id._compute_quantity(uom_qty_per_kit / kit_bom.product_qty, bom_line.product_id.uom_id, round=False)
                 if not qty_per_kit:
                     continue
                 incoming_moves = bom_line_moves.filtered(filters['incoming_moves'])