https://github.com/kubernetes/minikube/tree/master/pkg/minikube/machine
https://github.com/kubernetes/minikube/blob/master/pkg/minikube/machine/client.go
https://github.com/kubernetes/minikube/blob/master/pkg/minikube/machine/cache_images.go
    ->
    https://github.com/kubernetes/minikube/blob/master/cmd/minikube/cmd/start.go
        func RunStart