Add patches sync script

scripts/sync_patches.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+set -e
+
+usage() {
+	echo "Usage: $0 <procd git repository>"
+	exit 1
+}
+
+if [ $# -ne 1 ]; then
+        usage
+fi
+
+repo=$1
+tmpdir=/tmp/procd.$$
+
+git clone $repo $tmpdir
+
+for ver in openwrt-18.06 master; do
+	outdir=$(pwd)/patches/procd-$ver
+	git rm $outdir/00*
+	(cd $tmpdir && git format-patch --output-directory $outdir origin/$ver...origin/lxd/$ver)
+	git add $outdir/00*
+done