Merge remote-tracking branch 'origin/master' into rr_refactor

src/common/descriptor.c

src/knot/ctl/knotc_main.c

src/knot/ctl/remote.c

src/knot/main.c

src/knot/nameserver/axfr.c

src/knot/nameserver/ixfr.c

src/knot/nameserver/update.c

src/knot/server/tcp-handler.c

src/knot/server/xfr-handler.c

src/knot/server/zone-load.c

src/knot/server/zones.c

src/knot/server/zones.h

src/knot/updates/xfr-in.c

src/knot/updates/xfr-in.h

src/knot/zone/zone.c

src/zscanner/Makefile.am

tests-extra/README

tests-extra/tests/dnssec/dnskey_timestamps/test.py

tests-extra/tools/dnstest/params.py

tests-extra/tools/dnstest/server.py