[IMP] search a product on supplier reference and name

Hello,

Goal: In Purchase orders and supplier invoices, we should be able to retrive a record based on searching product by its supplier reference

Task: https://www.odoo.com/web#id=6951&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/r.aok9ne2C8jVbL0GY

Thanks.
https://docs.python.org/2/library/stdtypes.html?highlight=dict.get#dict.get