MycroftOS: Split rootfs overlay into board specifics folders

buildroot-external/board/raspberrypi/rootfs-overlay/usr/lib/systemd/scripts/iptables-flush

@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+# Usage: iptables-flush [6]
+#
+
+iptables=ip$1tables
+if ! type -p "$iptables"; then
+  echo "error: invalid argument"
+  exit 1
+fi
+
+while read -r table; do
+  tables+=("/var/lib/$iptables/empty-$table.rules")
+done <"/proc/net/ip$1_tables_names"
+
+if (( ${#tables[*]} )); then
+  cat "${tables[@]}" | "$iptables-restore"
+fi