make buildroot provision package re-usable for kic

[medyagh]

while debugging kic driver that why crictl can not list images in docker I found out the /etc/crictl.yaml is not pointing to the docker.sock and docker sytemd config looks different !
on VM it is

   CGroup: /system.slice/docker.service
           ├─1908 /usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --default-ulimit=nofile=1048576:1048576 --tlsverify --tlscacert /etc/docker/ca.pem --tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem --label provider=hyperkit --insecure-registry 10.96.0.0/12

but it in container its naked and not configured.

the provision package configures our dockerd
https://github.com/kubernetes/minikube/blob/master/pkg/provision/buildroot.go

has useful functions that could be used for both VM and container
for example: https://github.com/kubernetes/minikube/blob/master/pkg/provision/buildroot.go#L90
this function generates systemd files for docker. which inncludes insecure regteries...
which is used by VM but we should make this package agonistic of VM or Container.