Log Message:
NSD 4.0.2

Features:
* Return REFUSED for queries to non-hosted zones.

Bug Fixes:
* Fix expired zones to give SERVFAIL, also when parent zone loaded.
* documented nsd-control zonestatus output in nsd-control manpage.
* remove mention of nsdc from nsd-checkconf manpage.
* Disabled recvmmsg and sendmmsg usage by default because kernel
  versions have implementation issues: ipv6 ignored, security issues.
* Detect libevent2 install automatically by configure, and use
  event2 header files if necessary.
* Fix #551: change Regent to Copyright holder in the LICENSE,
  to match the definition on opensource.org for the BSD License.
* Fix #552: zonefile loads on nsd-control reconfig when the name
  of the file has changed.
* Fix leak of zone name after zonefile read and fix malloc too
  large that would be leaked in the radix tree.
* Fix from 3.2: make SOA RDATA comparisons in XFR more lenient (only
  check serial).
* Fix that NSD will delete and recreate not-clean-closed databases.