Merge branch 'container-systemd-reload' into 'master'

base-docker: support reload via 'kill' container runtime command

See merge request !313

roles/float-base-docker/templates/systemd.j2

@@ -21,6 +21,7 @@ ExecStart=/usr/lib/float/docker/run-{{ item.service }}-{{ item.container.name }}
 ExecStopPost=-/usr/bin/{{ container_runtime }} rm -f -i --cidfile=%t/%N.cid
 {% endif %}
 ExecStopPost=-rm -f %t/%N.cid
+ExecReload=/usr/bin/{{ container_runtime }} kill --signal SIGHUP {{ item.service }}-{{ item.container.name }}
 TimeoutStopSec=60
 TimeoutStartSec=240
 KillMode=mixed