TS-4991: jtest should handle Range requests.
TS-4991: jtest should handle Range requests.

This closes #1180

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