Log Message:
nsd: Update to 4.7.0

Changelog:
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--enable-root-server is obsolete, it is no longer used and defaults to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.

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.