tests/basic-test.sh: enable repo-noperm test only for non-root user

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

tests/basic-test.sh

@@ -369,6 +369,9 @@ cd test2-checkout
 touch should-not-be-fsynced
 $OSTREE commit -b test2 -s "Unfsynced commit" --fsync=false
 
+# Run this test only as non-root user.  When run as root, the chmod
+# won't have any effect.
+if test "$(id -u)" != "0"; then
     cd ${test_tmpdir}
     rm -f expected-fail error-message
     $OSTREE init --mode=archive-z2 --repo=repo-noperm
@@ -378,4 +381,4 @@ assert_has_file expected-fail
     assert_file_has_content error-message "Permission denied"
     chmod +w repo-noperm
     echo "ok unwritable repo was caught"
-
+fi