fix #432 wait to flush process output
fix #432 wait to flush process output

YOTOV-LIMITED/kudu,barnyp/kudu,shrimpy/kudu,MavenRain/kudu,kali786516/kudu,sitereactor/kudu,badescuga/kudu,badescuga/kudu,juvchan/kudu,juoni/kudu,duncansmart/kudu,shibayan/kudu,puneet-gupta/kudu,YOTOV-LIMITED/kudu,shibayan/kudu,MavenRain/kudu,kenegozi/kudu,WeAreMammoth/kudu-obsolete,EricSten-MSFT/kudu,puneet-gupta/kudu,projectkudu/kudu,juoni/kudu,oliver-feng/kudu,barnyp/kudu,shrimpy/kudu,barnyp/kudu,EricSten-MSFT/kudu,WeAreMammoth/kudu-obsolete,uQr/kudu,EricSten-MSFT/kudu,chrisrpatterson/kudu,dev-enthusiast/kudu,duncansmart/kudu,bbauya/kudu,YOTOV-LIMITED/kudu,juvchan/kudu,kali786516/kudu,kenegozi/kudu,shanselman/kudu,chrisrpatterson/kudu,EricSten-MSFT/kudu,kenegozi/kudu,mauricionr/kudu,badescuga/kudu,mauricionr/kudu,shibayan/kudu,uQr/kudu,dev-enthusiast/kudu,barnyp/kudu,projectkudu/kudu,uQr/kudu,YOTOV-LIMITED/kudu,juvchan/kudu,bbauya/kudu,MavenRain/kudu,oliver-feng/kudu,bbauya/kudu,projectkudu/kudu,puneet-gupta/kudu,badescuga/kudu,shibayan/kudu,kali786516/kudu,WeAreMammoth/kudu-obsolete,chrisrpatterson/kudu,juoni/kudu,oliver-feng/kudu,sitereactor/kudu,shibayan/kudu,oliver-feng/kudu,MavenRain/kudu,bbauya/kudu,shrimpy/kudu,sitereactor/kudu,kali786516/kudu,puneet-gupta/kudu,duncansmart/kudu,mauricionr/kudu,badescuga/kudu,EricSten-MSFT/kudu,sitereactor/kudu,juvchan/kudu,dev-enthusiast/kudu,kenegozi/kudu,juvchan/kudu,projectkudu/kudu,dev-enthusiast/kudu,mauricionr/kudu,duncansmart/kudu,projectkudu/kudu,shanselman/kudu,shanselman/kudu,shrimpy/kudu,puneet-gupta/kudu,sitereactor/kudu,uQr/kudu,chrisrpatterson/kudu,juoni/kudu