Last Friday, I walked into what used to be O’Brien’s Pub downtown. Same brick walls, same wooden tables, but the neon Budweiser sign was gone. In its place hung a carved wooden sign: “KavaScape.” Behind the counter, instead of beer taps, sat coconut shells and strainer bags. “We still get people ordering Jack and Coke,” the bartender told me, laughing. His name was Marcus, and six months ago he was slinging drinks at a nightclub.…