ceph-mon: add ExecStartPre docker stop to systemd

We already do that in the other systemd templates (mgr, mds, etc..)
and would present to add workaround in other orchestration tool.
This change is for containerized deployment only.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1882724

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>

roles/ceph-mon/templates/ceph-mon.service.j2

@@ -12,6 +12,8 @@ EnvironmentFile=-/etc/environment
 {% if container_binary == 'podman' %}
 ExecStartPre=-/usr/bin/rm -f /%t/%n-pid /%t/%n-cid
 ExecStartPre=-/usr/bin/{{ container_binary }} rm --storage ceph-mon-%i
+{% else %}
+ExecStartPre=-/usr/bin/{{ container_binary }} stop ceph-mon-%i
 {% endif %}
 ExecStartPre=-/usr/bin/{{ container_binary }} rm ceph-mon-%i
 ExecStartPre=/bin/sh -c '"$(command -v mkdir)" -p /etc/ceph /var/lib/ceph/mon'