deployment: introduce restartPolicy: never
If there is a crash in maintain-kubeusers, kubernetes will happily restart the pod, again and again (with the backoff mechanism).
However, in each partial run, the daemon may mess with statefull data.
I would rather stop completely the software in case of failure, so we can fix things by hand.
Signed-off-by: Arturo Borrero Gonzalez aborrero@wikimedia.org