Currently, if changing the inventory variable `kubeadm_patches`, new
patches will be created, but the existing ones will also be left on the
filesystem, and applied by kubeadm ; this means that removed or changed
configuration can linger.
Cleanup old patches (which are the difference between existing patches
on filesystem and the one created for the current runs).
Co-authored-by: Max Gautier <mg@max.gautier.name>
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