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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
ans7 -- "victim" server