reclimit: delegate to ans4 so that ans2 can behave like a real name server

bin/tests/system/reclimit/README

@@ -7,7 +7,6 @@ system test for recursion limits
 ns1  -- root server
 ans2 -- for example.org: delegate to ns1.(n+1).example.org for all n, up to the
                          value specified in ans.limit (or forever if limit is 0)
-        for example.net: delegate every query to 15 more name servers, with
-                         "victim" address
 ns3  -- resolver under test
+ans4 -- for ns*.example.com: return address records.
 ans7 -- "victim" server