©2015 Bloomberg News NSBYF26JTSEB (To get alerts for commodities columns: SALT CMMKT) (Bloomberg) — The fastest-growing drinks market in Japan isn’t craft beer or fruit smoothies. It’s $1 cups of black coffee from the local 7-Eleven. “Convenience-store coffee is just great, given its low price,” said Kiyoshi Fujimoto, a 50-year-old