Fixes#16
This is because without a CNI, nodes will never be ready and the task
will fail. You need to deploy your choice of CNI manually (such as
Calico) then check the state of the cluster using `kubectl get nodes`.
1. Now does not remove prerequisite packages, lvm2 was included in
these packages (not good when you use LVM2 for real).
2. Added a bit more idempotency to the shell scripts - only delete if
it exists.
3. Check that the process isn't running and binaries are gone.
1. Ability to specify control host address, for connecting to a control plane
provisioned outside of the role.
2. Ability to specify the control host token, again for connecting to
a control plane provisioned outside of the role.
3. Included upstream changes from @nolte to define KubeConfig file
permissions.
