[TS-2651] atscppapi: race conditions in destruction of async providers
[TS-2651] atscppapi: race conditions in destruction of async providers

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