Add support for running kubectl remotely as an alternative

[afbjorklund]

Some clients don't have the possibility to run the kubernetes client locally, due to binaries not being available...

But we already install kubectl on the control plane in the cluster, so we can run that using the ssh connection.

$ minikube kubectl --ssh=false -- get nodes
NAME       STATUS   ROLES                  AGE   VERSION
minikube   Ready    control-plane,master   12h   v1.20.2

$ minikube kubectl --ssh=true -- get nodes
NAME       STATUS   ROLES                  AGE   VERSION
minikube   Ready    control-plane,master   12h   v1.20.2

This makes minikube accessible on more platforms.

Especially when using the ssh driver for the cluster.

[medyagh]

sounds like a good idea !