TS-2177: Improve code quality of FeatureAPIHooks.
TS-2177: Improve code quality of FeatureAPIHooks.

PSUdaemon/trafficserver,reveller/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,davidbz/trafficserver,taoyunxing/trafficserver,clearswift/trafficserver,dyrock/trafficserver,vmamidi/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,chenglongwei/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,reveller/trafficserver,SolidWallOfCode/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,davidbz/trafficserver,PSUdaemon/trafficserver,persiaAziz/trafficserver,PSUdaemon/trafficserver,taoyunxing/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,PSUdaemon/trafficserver,vmamidi/trafficserver,chenglongwei/trafficserver,rpufky/trafficserver,bryancall/trafficserver,rahmalik/trafficserver,chitianhao/trafficserver,taoyunxing/trafficserver,taoyunxing/trafficserver,persiaAziz/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,PSUdaemon/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,reveller/trafficserver,PSUdaemon/trafficserver,chitianhao/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,taoyunxing/trafficserver,clearswift/trafficserver,duke8253/trafficserver,pbchou/trafficserver,rpufky/trafficserver,reveller/trafficserver,duke8253/trafficserver,pbchou/trafficserver,clearswift/trafficserver,persiaAziz/trafficserver,duke8253/trafficserver,rpufky/trafficserver,persiaAziz/trafficserver,rahmalik/trafficserver,clearswift/trafficserver,chitianhao/trafficserver,rahmalik/trafficserver,dyrock/trafficserver,chenglongwei/trafficserver,pbchou/trafficserver,duke8253/trafficserver,davidbz/trafficserver,clearswift/trafficserver,rahmalik/trafficserver,chenglongwei/trafficserver,chitianhao/trafficserver,rpufky/trafficserver,dyrock/trafficserver,dyrock/trafficserver,reveller/trafficserver,rahmalik/trafficserver,chenglongwei/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,persiaAziz/trafficserver,reveller/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,rpufky/trafficserver,reveller/trafficserver,chenglongwei/trafficserver,chenglongwei/trafficserver,rahmalik/trafficserver,vmamidi/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,reveller/trafficserver,taoyunxing/trafficserver,persiaAziz/trafficserver,bryancall/trafficserver,rahmalik/trafficserver,chitianhao/trafficserver,clearswift/trafficserver,rpufky/trafficserver,davidbz/trafficserver,rpufky/trafficserver,PSUdaemon/trafficserver,taoyunxing/trafficserver,dyrock/trafficserver,bryancall/trafficserver,taoyunxing/trafficserver,persiaAziz/trafficserver,rahmalik/trafficserver,clearswift/trafficserver,rahmalik/trafficserver,bryancall/trafficserver,taoyunxing/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,reveller/trafficserver,clearswift/trafficserver,chitianhao/trafficserver