auth-4.9: provide dns packet when doing lookup for presigned signatures

[Habbie]

Short description

backport of #14394

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)
• checked that this code was merged to master

[coveralls]

Pull Request Test Coverage Report for Build 11032581712

Details

• 5 of 5 (100.0%) changed or added relevant lines in 3 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.04%) to 63.174%

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Files with Coverage Reduction	New Missed Lines	%
pdns/packethandler.cc	1	72.51%
pdns/auth-secondarycommunicator.cc	2	64.65%

Totals
Change from base Build 11032388645:	0.04%
Covered Lines:	41786
Relevant Lines:	59383

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💛 - Coveralls

[zeha]

clang-tidy was angered with too short var names :)

[Habbie]

clang-tidy was angered with too short var names :)

then clang-tidy is going to take one for the team ;)