fix unit test for cert
fix unit test for cert

dalehamel/minikube,dlorenc/minikube,kubernetes/minikube,dlorenc/minikube,kubernetes/minikube,warmchang/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,dlorenc/minikube,warmchang/minikube,warmchang/minikube,dalehamel/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,dalehamel/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,dlorenc/minikube