[REF] mrp: adapt to new stock implementation

addons/mrp/data/mrp_demo.xml

addons/mrp/data/mrp_lot_demo.yml

addons/mrp/models/__init__.py

addons/mrp/models/mrp_production.py

addons/mrp/models/mrp_unbuild.py

addons/mrp/models/mrp_workorder.py

addons/mrp/models/stock_move.py

addons/mrp/models/stock_scrap.py

addons/mrp/security/ir.model.access.csv

addons/mrp/tests/test_order.py

addons/mrp/tests/test_workorder_operation.py

addons/mrp/views/mrp_production_views.xml

addons/mrp/views/mrp_workorder_views.xml

addons/mrp/views/stock_move_views.xml

addons/mrp/wizard/change_production_qty.py

addons/mrp/wizard/mrp_product_produce.py

addons/mrp/wizard/mrp_product_produce_views.xml

addons/mrp_repair/models/mrp_repair.py

addons/sale_mrp/models/procurement.py

addons/sale_mrp/sale_mrp.py