CAIRO (Reuters) - Secretary of State John Kerry will stress the importance of Egypt reaching an IMF loan agreement and the need for political consensus on painful economic reforms, a senior U.S. official said on Saturday. Kerry arrived in Egypt on his first visit to the Arab world since taking office for talks with the leaders of a country that is mired in political and economic crisis two years after the overthrow of autocrat Hosni Mubarak. With Egypt's pound and foreign currency reserves sliding, the official said that if Cairo could agree on a $4. ...