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The test setup for the DNSSEC tests has a secure root.

ns1 is the root server.

ns2 and ns3 are authoritative servers for the various test domains.

ns4 is a caching-only server, configured with the correct trusted key
for the root.

ns5 is a caching-only server, configured with the an incorrect trusted
key for the root.  It is used for testing failure cases.

ns6 is a caching-only server configured to use DLV.

ns7 is used for checking non-cacheable answers.
