TS-1314: fix signed/unsigned warnings
TS-1314: fix signed/unsigned warnings

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