systemd: add inhibit directory type

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
xserver: fix xserver_manage_xdm_spool_files missing requirement

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
systemd: allow tmpfiles to connect to syslog

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>