By Luc Olinga Foot traffic improves at Whole Foods and Amazon Fresh, while physical store sales have increased in the last three quarters. In the eyes of investors, Amazon’s performance and future prospects are viewed and interpreted in terms of the health of its cloud division. And with good reason: Amazon Web Services is the sales engine or locomotive of the e-commerce giant. In the third quarter, AWS accounted for all of Amazon’s $4.9 billion in operating income. It will probably still be the same for the fourth quarter and the next few months as the cloud infrastructure keeps growing thank…