auth rfc2136: more churning

[miodvallat]

Short description

Now that I got you to buy the updateContext struct, put more things into it.

Checklist

I have:

• read the CONTRIBUTING.md document
• read and accepted the Developer Certificate of Origin document, including the AI Policy, and added a "Signed-off-by" to my commits
• 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)

[coveralls]

Pull Request Test Coverage Report for Build 18715523380

Details

• 135 of 185 (72.97%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 72.997%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pdns/rfc2136handler.cc	135	185	72.97%

Totals
Change from base Build 18715518373:	0.007%
Covered Lines:	127427
Relevant Lines:	163863

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💛 - Coveralls