WASHINGTON (Reuters) - Revolution in Iran appears to be a matter of time, U.S. Defense Secretary Leon Panetta predicted on Tuesday, saying the Iranian reform movement was learning from revolts in Tunisia, Egypt, Libya and Syria. Panetta, a former CIA director who took over the Pentagon's top job in July, was asked on the Charlie Rose television show whether the Arab Spring might spread to non-Arab Iran. Panetta responded: "Absolutely." "I think we saw in evidence of that in the last election in Iran that there was a movement within Iran that raised those very same concerns that we're seeing...