Avoid cert callback if no verification is requested.
Avoid cert callback if no verification is requested.

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