Merge branch 'csk_rollovers' into 'master'

doc/operation.rst

src/knot/dnssec/kasp/kasp_db.c

src/knot/dnssec/kasp/kasp_zone.c

src/knot/dnssec/kasp/policy.h

src/knot/dnssec/key-events.c

src/knot/dnssec/zone-events.c

src/knot/dnssec/zone-keys.c

src/knot/dnssec/zone-keys.h

src/knot/events/handlers/parent_ds_query.c

src/utils/keymgr/functions.c

tests-extra/tests/dnssec/csk_rollovers/data/com.zone

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

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

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