Add a retry to the cluster_env test.
Add a retry to the cluster_env test.

mikegrass/minikube,dlorenc/minikube,budhrg/minishift,aaron-prindle/minikube,dalehamel/minikube,mikegrass/minikube,praveenkumar/minishift,LalatenduMohanty/minishift,kubernetes/minikube,endocode/minikube,luxas/minikube,kubernetes/minikube,dlorenc/minikube,kubernetes/minikube,dongsupark/minikube,skipjaq/minikube,dlorenc/minikube,kubernetes/minikube,dalehamel/minikube,aaron-prindle/minikube,aaron-prindle/minikube,dims/minikube,jimmidyson/minishift,cu12/minikube,minishift/minishift,dims/minikube,jimmidyson/minishift,warmchang/minikube,warmchang/minikube,warmchang/minikube,jimmidyson/minishift,dlorenc/minikube,thatdocslady/minishift,thatdocslady/minishift,praveenkumar/minishift,LalatenduMohanty/minishift,praveenkumar/minishift,luxas/minikube,dlorenc/minikube,mikegrass/minikube,kubernetes/minikube,budhrg/minishift,thatdocslady/minishift,cu12/minikube,abbytiz/minikube,Preeticp/minishift,Preeticp/minishift,abbytiz/minikube,warmchang/minikube,dongsupark/minikube,warmchang/minikube,budhrg/minishift,skipjaq/minikube,dongsupark/minikube,dalehamel/minikube,LalatenduMohanty/minishift,r2d4/minikube,dlorenc/minikube,endocode/minikube,r2d4/minikube,Preeticp/minishift,abbytiz/minikube,endocode/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,cu12/minikube,skipjaq/minikube,warmchang/minikube,dims/minikube,minishift/minishift,dlorenc/minikube,minishift/minishift,dlorenc/minikube,r2d4/minikube