Merge branch 'master' into axfr-ignore-semerr

src/knot/server/xfr-handler.c

src/knot/server/zone-load.c

src/knot/server/zones.c

src/knot/server/zones.h

src/knot/zone/semantic-check.c

src/libknot/nameserver/name-server.c

src/libknot/packet/response.c