Log Message:
nsd: Update to 4.3.0

Changelog:

10 March 2020: Wouter
	- repository has version number 4.3.0.  Tag for 4.3.0rc1.

3 March 2020: Wouter
	- Fix that the retry wait does not exceed one day for zone transfers.

27 February 2020: Wouter
	- Fix warning on FreeBSD about pointer size cast.

26 February 2020: Wouter
	- Fixup fix of reuseport TCP for server close of sockets not used
	  by it.  And the unit test skips when the necessary debug output
	  is not enabled.

25 February 2020: Wouter
	- Fix event unit test, signal has to be registered with signal_add,
	  event_add not for every backend for signals.  The event_initialized
	  is not possible for every backend, so event_added variable.  The
	  agent write event fires after a timeout, instead of on event write
	  so that it does not trigger a sigpipe event when the handlers stop.
	  Timeout shorted to 0.1 second.  event_get_fd was not implemented,
	  so used ev_fd.  Debug output printfs added to see what happens.
	- Fix checkconf test for new drop-updates config option.
	- Fix errors with reuseport and TCP file descriptors, it was
	  closing them for server-1 in server-2 and server-3..

7 February 2020: Jeroen
	- Add feature to drop queries with opcode UPDATE.

6 February 2020: Jeroen
	- Support SO_BINDTODEVICE on Linux. Specify bindtodevice: yes
	  to bind sockets directly to the network interface.
	- Support SO_SETFIB on FreeBSD. Add setfib=<FIB> after an ip-address
	  option to use the specified FIB for that socket.
	- Require user to add servers=<range> after an ip-address option to
	  specify the servers that must listen on that socket.

6 February 2020: Wouter
	- Merge PR#60: Minor portability fixes from michaelforney, with
	  avoid pointer arithmetic on void* and avoid unnecessary VLA.

4 February 2020: Wouter
	- Merge PR#22: minimise-any: prefer polular and not large RRset,
	  from Daisuke Higashi.
	- Fix responses for IXFR so that the authority section is not echoed
	  in the response.

21 January 2020: Wouter
	- Fix leak in server bitset setup.

16 January 2020: Jeroen
	- Add zone resource record iterator for future zone-verification port.
	- Set FD_CLOEXEC on opened sockets.
	- Add popen3 implementation for future zone-verification port.
	- Add -r option to cutest so that a subset of tests can be run.

15 January 2020: Jeroen
	- Add feature to pin server proccesses to specific cpus.
	- Add feature to pin IP addresses to selected server processes.
	- Set process title to identify individual processes.

13 January 2020: Wouter
	- Merge pull request #59 from buddyns: add FreeBSD support
	  for conf key ip-transparent.

10 January 2020: Wouter
	- Fix unreachable code in ssl set options code.
	- Fix bad shift in assertion code analyzer complaint.

6 January 2020: Wouter
	- Fix #56: Drop sparse TSIG signing support in NSD.
	  Sign every axfr packet with TSIG, according to the latest
	  draft-ietf-dnsop-rfc2845bis-06, Section 5.3.1.

12 December 2019: Wouter
	- Note that use-systemd is not necessary and ignored in man page.

11 December 2019: Wouter
	- Fix whitespace in nsd.conf.sample.in, patch from Paul Wouters.
	- use-systemd is ignored in nsd.conf, when NSD is compiled with
	  libsystemd it always signals readiness, if possible.

9 December 2019: Wouter
	- Fix to define upper bounds on rr counts read from untrusted packet
	  data.
	- Try different annotation for radix_find_prefix_node not reachable.
	- Separate acl_addr_match_range functions for ip4 and ip6, to
	  please checkers.
	- Avoid unused variable warning in new match_range_v4 function.

6 December 2019: Wouter
	- Fix to define max number of EDNS records we are willing to
	  spend time on.
	- Fix size of string len and capacity type cast in udbradtree.
	- Fix to protect rrcount in tsig_find_rr from overflow.
	- Annotate radix_find_prefix_node not reachable trail code.
	- Fix to protect rrcount in packet_find_notify_serial from overflow.
	- Fix to close socket on error in create_tcp_accept_sock.
	- Fix to log on failure to chmod for socket for remote control.
	- Fix to remove unneeded if in open of socket for remote control.
	- Fix to restore input parameter on call failure in create_dirs.
	- Please checker by terminating and initialising string read
	  by remote control.
	- Fixup of random_generate negative modulo, from previous commit,
	  and return srandom when random is used if no getrandom.

5 December 2019: Wouter
	- Fix fname null check of fname in namedb_read_zonefile.
	- Fix implicit cast of size in udb_radnode_array_grow.
	- Fix ignore of return value of ssl_printf in remote.c.
	- Fix unused check of fd in parent_handle_reload_command.
	- Fix to use getrandom() for randomness, if available.
	- Attempt to fix signedness of nscount lookup in ixfr query_process.
	- Fix identical branches for ssl_print of errors in remote.c.
	- Fix type cast bounds, signedness of opt_rdlen in edns_parse_record.
	- Fix to separate header and data lines in parse_zone_list_file.