Updated cpu check to handle none driver cpu check
Updated cpu check to handle none driver cpu check

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