[MIG] product_expiry: migration to new api

addons/product_expiry/__openerp__.py

addons/product_expiry/data/product_expiry_data.xml

addons/product_expiry/data/product_expiry_demo.xml

addons/product_expiry/models/__init__.py

addons/product_expiry/models/product_product.py

addons/product_expiry/models/production_lot.py

addons/product_expiry/models/stock_quant.py

addons/product_expiry/views/product_expiry_view.xml

addons/product_expiry/views/product_template_views.xml

addons/product_expiry/views/production_lot_views.xml

addons/product_expiry/views/stock_quant_views.xml