Handle case where VMDriver is set, but Driver is not
Handle case where VMDriver is set, but Driver is not

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