Fix some test cases

The tar tests still don't pass, but at least now it's because of
a problem with Busybox and not the tests themselves.

Signed-off-by: Dan Fandrich <dan@coneharvesters.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

testsuite/makedevs.tests

@@ -4,6 +4,11 @@
 
 . ./testing.sh
 
+test x"`id -u`" = x"0" || {
+	echo "SKIPPED: makedevs (must be root to test this)"
+	exit 0
+}
+
 unset LANG
 unset LC_COLLATE
 unset LC_ALL