Copyright (C) 2014, 2016  Internet Systems Consortium, Inc. ("ISC")

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system test for recursion limits

ns1  -- root server
ans2 -- delegate to ns1.(n+1).example.com for all n, up to
        the value specified in ans.limit (or forever if limit is 0)
ns3  -- resolver under test
ans4 -- delegates every query to 16 more name servers, with "victim" address
ans7 -- "victim" server