Upon breaking the tape on a pristine St. Patrick’s Day morning in the City of Angels, Dominic Ngeno dropped to his knees and kissed the ground in celebration of winning the 39th Los Angeles Marathon. Ethiopian Markos Geneti set the L.A. Marathon men’s record of 2:06:35 in 2011, but Sunday was about the Kenyans — Ngeno, Kiplimo and Stacy Ndiwa, …