netcardconfig doesn't properly handle this section and it disappears
when configuring network devices then.
Rewriting netcardconfig is on our agenda (see
https://github.com/grml/grml-network/issues/11), until we get there
let's make sure the status quo works as good as possible.
Take over wording based on what ifupdown's postinst script uses.
# config for loopback networking
cat > $IFFILE << EOF
-# Initially generated on boot by initramfs
+# Initially generated on boot by initramfs,
+# interfaces(5) file used by ifup(8) and ifdown(8)
+
+# Include files from /etc/network/interfaces.d:
+source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
echo>> $IFFILE
done
-echo '# Support overriding defaults:' >> $IFFILE
-echo 'source /etc/network/interfaces.d/*' >> $IFFILE
-echo>> $IFFILE
-
# dns bootoption
if [ -n "$DNSSERVERS" ]
then