Should use same version for kubectl and cluster

[olberger]

I've noticed the following message:

/usr/local/bin/kubectl is version 1.16.2, and is incompatible with Kubernetes 1.14.0. You will need to update /usr/local/bin/kubectl or use 'minikube kubectl' to connect with this cluster

Ideally, I guess vagrant-provision.sh should then download the corresponding version... which should require transmission of that version number from env vars, etc.

On the other hand, it may well happen that that message is a bit wrong, and it just works ;)