LOUCOUMANE COULIBALY  IVORY Coast's President Alassane Ouattara has confirmed his younger brother Tene Birahima Ouattara as minister of defence, part of a slate of new appointments announced on Tuesday. The new defence minister will have to contend with Islamist violence spilling over from Burkina Faso in the north, and continue reforms that have calmed a series of army mutinies that threatened stability in the world's top cocoa-producing nation. Three soldiers were killed when dozens of militants attacked two military posts last week. Tene Birahima Ouattara was named interim defence minister in March after the death of Hamed Bakayoko, who had…