Add missing Product class.

Task #072807

__init__.py

@@ -13,5 +13,6 @@ def register():
         product.Category,
         product.TemplateCompany,
         product.Template,
+        product.Product,
         stock.Lot,
         module='stock_lot_sequence', type_='model')

product.py

@@ -123,3 +123,7 @@ class Template(metaclass=PoolMeta):
                 states={
                     'invisible': ~Eval('context', {}).get('company'),
                     }))
+
+
+class Product(metaclass=PoolMeta):
+    __name__ = 'product.product'