libknot: cleanup knot_pkt_t zeroing

See merge request knot/knot-dns!1050

It is only called on a memzeroed knot_pkt_t, so there's nothing
to clear, except for the lines we kept there
(for compatibility, I'm not sure whether they're actually useful)

I saw weird call stacks in profile under knot_pkt_new(),
e.g. freeing data.

dnssec: CSK rollovers: avoid double-signing zone...

See merge request knot/knot-dns!1045

dnssec: implemented RRSIG pre-refresh to avoid freqent sign events

See merge request knot/knot-dns!1038

...at ready and retire-active phase

code refactoring of node removals

See merge request knot/knot-dns!1047

Don't verify signatures created by Knot

See merge request knot/knot-dns!1043

Double changeset

See merge request knot/knot-dns!1032

zone load: double changeset works only without the feature ignoring DNSSEC changes on ixfr-from-diff

first one having a diff of zone history for use by slaves
second one diff between zonefile and zone for use with restart

Libor Peltan authored 5 years ago and Daniel Salzman committed 5 years ago

while keeping the changeset soa_from and soa_to

logging: which RR causes ENORECORD with strict update

See merge request knot/knot-dns!1046