Make the test cache repository a bit more resilient against partial clones
Make the test cache repository a bit more resilient against partial clones

Fixes #589

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