It’s 10 a.m. on a Wednesday at Diageo, one of the world’s largest producers of spirits (and owner of brands such as Johnnie Walker, Captain Morgan, Guinness and Smirnoff). Dozens of its 150 Manhattan-based employees are clustered around the office bar, adjacent to the entrance of the company’s 56,000-square-foot office. But they’re not here to drink -- even people who work for booze companies have their limits. (Alcohol is primarily served at night during events and employee happy hours.) Instead, by day, the bar becomes a casual meeting point.