Fixed opensuse template to make lxc-shutdown work.

The fix is described by:
https://wiki.archlinux.org/index.php/Linux_Containers#Container_cannot_be_shutdown_if_using_systemd

Signed-off-by: Cedric Bosdonnat <cbosdonnat@suse.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>