Changed the error message style in test case.
Changed the error message style in test case.

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