By Daniel Kline Carnival limits how much alcohol passengers can drink with its “unlimited” package. It’s now making another change that’s not going to be popular. Entire social-media groups are devoted to the various all-you-can-drink packages offered by the major cruise lines. People love to share not only what their favorite drinks are, but their thoughts on the best bars, favorite bartenders, and (sometimes) exactly how much value they managed to extract from the drink packages they bought. In the Royal Caribbean (RCL) – Get Royal Caribbean Group Report Deluxe Beverage Package Facebook grou…