Add checks to the kasp system test to verify CDNSKEY publication. This test is not entirely complete, because when there is a CDNSKEY available but there should not be one for KEY N, it is hard to tell whether the existing CDNSKEY actually belongs to KEY N or another key. The check works if we expect a CDNSKEY although we cannot guarantee that the CDNSKEY is correct: The test verifies existence, not correctness of the record.
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The test setup for the KASP tests.
ns1 is reserved for the root server.
ns2 is running primary service for ns3.
ns3 is an authoritative server for the various test domains.
ns4 and ns5 are authoritative servers for various test domains related to views.