This is long overdue: services feature influences live
and rescue but doesn't do anything to the installed system
as that's behind the installation barrier; some piggybacking
required to do that has been merged into installer back in
2012 apparently (thanks to boyarsh@ for both doing that and
bringing my attention to this fact; it's 65-setup-services.sh
as of today).

So the only thing missing has been the bridge to prepare
those files -- still some more tweakery is required given the
two-stage process arranged so that reusable configuration could
include some sane defaults but the release manager is ultimately
able to override anything without extra kludges; thank legion@
for his wonderful libshell either.

NB: install2 script is a partial clone of rootfs one since
processing the variables is identical; still rootfs script
has to change service state directly while install2 one
has to deposit the information for installer to handle.