TS-3918: fix gcc unsigned comparisons
TS-3918: fix gcc unsigned comparisons

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