Add automated filesystem checking based on scripts I've used now for

quite some time locally. Most of the test require root so they are
	skipped when run without necessarry privelegies.

tests/udf_test.in

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -e
+
+if [ "x$EUID" = "x" ] ; then
+  EUID=`id -u`
+fi
+
+if [ "$EUID" != 0 ] ; then
+   exit 77
+fi
+
+if ! which mkudffs >/dev/null 2>&1; then
+   echo "mkudffs not installed; cannot test UDF."
+   exit 77
+fi
+
+"@builddir@/grub-fs-tester" udf
+