TS-1856: fix unsigned comparison warnings
TS-1856: fix unsigned comparison warnings

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