By Thiam Ndiaga and Anne Mimault OUAGADOUGOU (Reuters) -Armed soldiers in fatigues and masks appeared on television in Burkina Faso on Friday night to confirm the ouster of President Paul-Henri Damiba, the second coup in the troubled West African country this year. The announcement capped a day that began with gunfire near a military camp in the capital Ouagadougou, an explosion near the presidential palace, and interruptions to state television programming. It is a pattern that has become increasingly familiar in West and Central Africa in the past two years as Islamist insurgents wreak havoc…