By:  John Strege   Pop star Niall Horan of the boy band One Direction, a friend of Rory McIlroy and an avid golfer, who reportedly has entered the golf agency business.  The Sun has reported that during One Direction’s hiatus Horan is helping launch Modest Golf Management, a division of Modest Management, the agency that represents One Direction. Modest Golf Management, according to the Sun, will attempt to recruit Irish and British golfers.  Horan, the story said, recruited Mark McDonnell, a