init: drop stage2/image-scripts.d/91-systemd

features.in/init/stage2/image-scripts.d/91-systemd

-#!/bin/sh
-
-# the part below relates to systemd as init specifically
-rpm -q systemd-sysvinit || exit 0
-
-sub() {
-	local file="$1"
-	shift
-	for i in "$@"; do
-		grep -q "^$i" "$file" || echo "$i" >> "$file"
-	done
-}
-
-# aufs2 root is rw in reality; but don't bother if there's a record already
-grep -q '[[:space:]]/[[:space:]]' /etc/fstab ||
-	sub /etc/fstab '/dev/root / auto defaults 0 0'