By Rami Amichai TEL AVIV (Reuters) - Israel's ex-Prime Minister Ehud Olmert was sentenced to six years in jail on Tuesday for taking bribes in a massive real estate deal, a crime the judge said was akin to treason. The first criminal conviction of a former Israeli head of government all but ended speculation that Olmert - a centrist credited internationally with working towards a peace settlement with the Palestinians - might return to political life. \"A public servant who takes bribes is akin to a traitor,\" said Judge David Rozen of the Tel Aviv District Court.