(Reuters) - Shares of Fuller, Smith & Turner jumped 21 percent after the British pub operator and brewer agreed to sell its beer business to Japan's Asahi for an enterprise value of 250 million pounds.Fuller, which looks to be a focused, premium pub and hotel operator after the disposal, said the business being sold comprises its beer, cider and soft drinks brewing and production, wine wholesaling and distribution among others. Asahi's unit would buy the brands of Fuller's beer business and..