WASHINGTON (Reuters) - Veteran Algerian diplomat Lakhdar Brahimi is expected to replace Kofi Annan as the U.N.-Arab League joint special envoy for Syria barring a last-minute change, diplomats said on Thursday. The former Algerian foreign minister, who has a long history as a diplomatic troubleshooter, will have his work cut out for him in Syria, where President Bashar al-Assad is using his security forces to try to crush a 17-month-old pro-democracy rebellion. Annan, a former U.N. ...