[bug#27374] Update Knot DNS to 2.5.1.

[Tobias Geerinckx-Rice]

[Ack! It's been so long that I forgot how to list. This was meant for
guix-patches, not bug-guix, of course...]

Guix,

Knot DNS >=2.5 uses a new, LMDB-based (DNSSEC) key database format. It
ships a new ‘pykeymgr’ script to manually migrate keys from the older
JSON format.

These patches update Knot to 2.5.1, add the required python-lmdb
bindings, and throw in a real LMDB description for good measure.

I use Knot 2.5.1 & DNSSEC but haven't any 2.4-format key databases to
import. If you do, your feedback would be very welcome.

Kind regards,

T G-R

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