NSD 4.7.0

This release adds a script for bash autocompletion for nsd-control. Also
nsd-control can be configured to use unencrypted operation also when
compiled without openssl. There is also a systemd service unit example
file contributed. The dnstap log service can be contacted over TCP, with
the dnstap-ip: ip option. It is also possible to use TLS, with
dnstap-tls, it is enabled by default, and can be configured with the
dnstap-server-name, dnstap-cert-bundle, dnstap-client-key-file and
dnstap-client-cert-file options. The configure option
--enable-root-server is obsolete, it is no longer used and defaults to
on. In addition, the build file should support multicore build with
flex and bison more easily.

4.7.0

FEATURES:

• Merge #263: Add bash autocompletion script for nsd-control.
• Fix #267: Allow unencrypted local operation of nsd-control.
• Merge #269 from Fale: Add systemd service unit.
• Fix #271: DNSTAP over TCP, with dnstap-ip: "127.0.0.1@3333".
• dnstap over TLS, default enabled. Configured with the
  options dnstap-tls, dnstap-tls-server-name, dnstap-tls-cert-bundle,
  dnstap-tls-client-key-file and dnstap-tls-client-cert-file.

BUG FIXES:

• Fix #239: -Wincompatible-pointer-types warning in remote.c.
• Fix configure for -Wstrict-prototypes.
• Fix #262: Zone(s) not synchronizing properly via TLS.
• Fix for #262: More error logging for SSL read failures for zone
  transfers.
• Merge #265: Fix C99 compatibility issue.
• Fix #266: Fix build with --without-ssl.
• Fix for #267: neater variable definitions.
• Fix #270: reserved identifier violation.
• Fix to clean more memory on exit of dnstap collector.
• Fix dnstap to not check socket path when using IP address.
• Fix to compile without ssl with dnstap-tls code.
• Dnstap tls code fixes.
• Fix include brackets for ssl.h include statements, instead of quotes.
• Fix static analyzer warning about nsd_event_method initialization.
• Fix #273: Large TXT record breaks AXFR.
• Fix ixfr create from adding too many record types.
• Fix cirrus script for submit to coverity scan to libtoolize
  the configure script components config.guess and config.sub.
• Fix readme status badge links.
• make depend.
• Fix for build to run flex and bison before compiling code that needs
  the headers.
• Fix to remove unused whitespace from acx_nlnetlabs.m4 and config.h.
• For #279: Note that autoreconf -fi creates the configure script
  and also the needed auxiliary files, for autoconf 2.69 and 2.71.
• Fix unused variable warning in unit test, from clang compile.
• Fix #240: Prefix messages originating from verifier.
• Fix #275: Drop unnecessary root server checks.