(cherry picked from commit 73486c13f743407a50d5bbadde90c949a696506f)
(cherry picked from commit 584a1cff8b)
Copyright (C) Internet Systems Consortium, Inc. ("ISC")
See COPYRIGHT in the source root or http://isc.org/copyright.html for terms.
ns1 is the root server.
ns2 and ns5 are both authoritative servers.
ans3 is a mock authoritative server that can return various broken
responses.
ans4 is a mock authoritative server that can return CNAME or DNAME
responses of arbitrary size in arbitrary order.
ns7 is the resolver under test.