Merge branch 'multi_signer1' into 'master'

distro/pkg/deb/libknot12.symbols

doc/man/knot.conf.5in

doc/reference.rst

src/knot/conf/schema.c

src/knot/conf/schema.h

src/knot/conf/tools.c

src/knot/dnssec/context.c

src/knot/dnssec/kasp/policy.h

src/knot/dnssec/key_records.c

src/knot/dnssec/key_records.h

src/knot/dnssec/zone-sign.c

src/knot/dnssec/zone-sign.h

src/knot/updates/ddns.c

src/libknot/rdataset.c

src/libknot/rdataset.h

src/utils/keymgr/offline_ksk.c

tests-extra/tests/ddns/basic/test.py

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

tests-extra/tools/dnstest/server.py

tests/libknot/test_rdataset.c