Merge branch 'master' into merge-nameserver-server

src/knot/dnssec/nsec-chain.c

src/knot/dnssec/nsec-chain.h

src/knot/dnssec/nsec3-chain.c

src/knot/nameserver/nsec_proofs.c

src/knot/updates/ddns.c

src/knot/zone/node.c

src/knot/zone/node.h

tests-extra/tests/ixfr/from_differences/02_remove/step.py

...ra/tests/ixfr/from_differences/04_change/example.com.zone

.../tests/ixfr/from_differences/04_change/example.com.zone.1

.../tests/ixfr/from_differences/04_change/example.com.zone.2

.../tests/ixfr/from_differences/04_change/example.com.zone.3

tests-extra/tests/ixfr/from_differences/04_change/step.py

tests-extra/tools/dnstest/response.py