Merge branch 'nsec_optimi2reb' into 'master'

src/knot/dnssec/nsec-chain.c

src/knot/dnssec/nsec-chain.h

src/knot/dnssec/nsec3-chain.c

src/knot/dnssec/nsec3-chain.h

src/knot/dnssec/zone-nsec.c

src/knot/dnssec/zone-sign.c

src/knot/dnssec/zone-sign.h

src/knot/zone/zone-tree.c

src/knot/zone/zone-tree.h

tests/knot/test_zone-tree.c