[TS-2652] Allowing cancelation of AsyncProviders
[TS-2652] Allowing cancelation of AsyncProviders

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