HAProxy and RabbitMQ can reload their TLS certificate on change,
without being restarted. To do that, a post-save script scan the
list of running container, copy the new certs and trigger a reload
action in the service.
Make sure that those post-save script only get the right container
out of the "$container_cli ps" command, i.e. that the scripts Work
both with HA and non-HA deployments.
(cherry picked from commit