4077. [test] Add static-stub regression test for DS NXDOMAIN

return making the static stub disappear. [RT #38564]

(cherry picked from commit be9720ae2c)
(cherry picked from commit f0d388e561)

bin/tests/system/staticstub/ns2/named.conf.in

@@ -66,3 +66,8 @@ zone "example.info" {
 	type static-stub;
 	server-addresses { ::1; }; #ns4
 };
+
+zone "undelegated" {
+	type static-stub;
+	server-addresses { 10.53.0.3; };
+};