SAN FRANCISCO, April 24 (Reuters) - Ted Turner said on Thursday too few people owned too many media organizations and called rival media baron Rupert Murdoch a warmonger for what he said was Murdoch's promotion of the U.S. war in Iraq. "He's a warmonger," Turner said in an evening speech to the Commonwealth Club in San Francisco of Murdoch, whose News Corp. Ltd. owns the fast-growing Fox News Channel. "He promoted it." Fox News Channel has been the most popular U.S. cable news network during the conflict, trumping AOL Time Warner Inc.'s CNN, which Turner started more than two decades...