Clean up zombie_event that didn't expire.
Clean up zombie_event that didn't expire.

vmamidi/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,pbchou/trafficserver,bryancall/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,bryancall/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,davidbz/trafficserver,bryancall/trafficserver,davidbz/trafficserver,davidbz/trafficserver,pbchou/trafficserver,pbchou/trafficserver,bryancall/trafficserver,duke8253/trafficserver,davidbz/trafficserver,duke8253/trafficserver,pbchou/trafficserver,duke8253/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,pbchou/trafficserver,bryancall/trafficserver,dyrock/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,davidbz/trafficserver,duke8253/trafficserver