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Fix autosign system test, allow expired zone signatures to be replaced with KSK RRSIGs

Merged Matthijs Mekking requested to merge 3035-dnssec-policy-stops-signing-when-removing-zsk into main

BIND can log this warning:

    zone example.ch/IN (signed): Key example.ch/ECDSAP256SHA256/56340
      missing or inactive and has no replacement: retaining signatures.

This log can happen when BIND tries to remove signatures because the are about to expire or to be resigned. These RRsets may be signed with the KSK if the ZSK files has been removed from disk. When we have created a new ZSK we can replace the signatures creeated by the KSK with signatures from the new ZSK.

It complains about the KSK being missing or inactive, but actually it takes the key id from the RRSIG.

The warning is logged if BIND detects the private ZSK file is missing.

The warning is logged even if we were able to delete the signature.

With the change from this commit it only logs this warning if it is not okay to delete the signature.

Closes #3035 (closed), #3049 (closed)

Edited by Michał Kępień

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