HONG KONG (Reuters) - Octogenarian Hong Kong billionaire Li Ka-shing mapped out a succession plan for one of Asia's biggest family empires, ensuring a smoother transition for the Cheung Kong group than that of real estate rival Sun Hung Kai Properties . Li told investors that while he had no plans to retire, elder son Victor would eventually take over at Cheung Kong Holdings and Hutchison Whampoa , the real estate to telecoms empire founded by Asia's richest man. The 83-year-old, whose personal wealth of $25. ...