init: rework de-systemd-ization

It's the very same problem that must be solved within mkimage:
some package lists get expanded early and some late thus having
no chance to influence apt's choices of alternatives made early
(in fact, too early).

Until that, here's another kludge...

PS: turns out that ^systemd- is not "drop ^systemd" but rather:
    systemd-analyze
    systemd-coredump
    systemd-journal-gateway
    systemd-networkd
    systemd-sysvinit
    -- thus one /really/ wants something else.

features.in/init/config.mk

@@ -4,13 +4,15 @@
 use/init:
 	@$(call add_feature)
 	@$(call add,THE_LISTS,$$(INIT_TYPE))
+	@$(call add,RESCUE_LISTS,$$(INIT_TYPE))
 
 # THE_LISTS is too late when BASE_PACKAGES have pulled in
 # the wrong syslogd-daemon provider already
 use/init/sysv: use/init
 	@$(call set,INIT_TYPE,sysvinit)
 	@$(call add,BASE_PACKAGES,syslogd)
-	@$(call add,BASE_PACKAGES_REGEXP,^systemd- ^systemd-services-)
+	@$(call add,BASE_PACKAGES_REGEXP,^systemd-services-)
+	@$(call add,BASE_PACKAGES_REGEXP,^systemd-networkd-)
 
 use/init/sysv/polkit: use/init/sysv
 	@$(call add,THE_PACKAGES,polkit-sysvinit)

pkg.in/lists/sysvinit

@@ -1,3 +1,5 @@
 sysvinit
 sysklogd
 interactivesystem
+
+systemd-