By Adam Jourdan SHANGHAI (Reuters) - A former property banker, Briton Alex Jarvis, said he fell into China's football boom with a chance encounter in the first class lounge of a cruise liner bound for New York in 2011. Three months later, he was in Chongqing, one of China's biggest cities, on a deal. Another former financier, Harry Spencer, said he stumbled on China's football mania when he met people while playing bridge. More...