TS-1797 improve ClusterMachine::pop_ClusterHandler() when ts starting
TS-1797 improve ClusterMachine::pop_ClusterHandler() when ts starting

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