triage systemd and mr out of wheezy

mr follows triage in jessie

systemd/CVE-2018-6954 is triaged like CVE-2013-4392 although I'm feel
that wheezy *may* have support for tmpfiles.d - at least the manpage
is there... considering how limited systemd support was in wheezy,
however, i suspect it's fair to assume it's not largely used.