Log Message:
Upgrade unbound to version 1.7.1.

Upstream changes:

Features
- Add --with-libhiredis, unbound support for a new cachedb
  backend that uses a Redis server as the storage.  This
  implementation depends on the hiredis client library
  (https://redislabs.com/lp/hiredis/).
  And unbound should be built with both --enable-cachedb and
  --with-libhiredis[=PATH] (where $PATH/include/hiredis/hiredis.h
  should exist).  Patch from Jinmei Tatuya (Infoblox).
- Create additional tls service interfaces by opening them on other
  portnumbers and listing the portnumbers as additional-tls-port: nr.
- ED448 support.
- num.query.authzone.up and num.query.authzone.down statistics counters.
- Accept both option names with and without colon for get_option
  and set_option.
- low-rtt and low-rtt-pct in unbound.conf enable the server selection
  of fast servers for some percentage of the time.
- num.query.aggressive.NOERROR and num.query.aggressive.NXDOMAIN
  statistics counters.
- allow-notify: config statement for auth-zones.
- Can set tls authentication with forward-addr: IP#tls.auth.name
  And put the public cert bundle in tls-cert-bundle: "ca-bundle.pem".
  such as forward-addr: 9.9.9.9@853#dns.quad9.net or
  1.1.1.1@853#cloudflare-dns.com
- list_auth_zones unbound-control command.
- Added root-key-sentinel support

Bug Fixes
- Fix #3727: Protocol name is TLS, options have been renamed but
  documentation is not consistent.
- Check IXFR start serial.
- Fix typo in documentation.
- Fix #3736: Fix 0 TTL domains stuck on SERVFAIL unless manually
  flushed with serve-expired on.
- Fix #3817: core dump happens in libunbound delete, when queued
  servfail hits deleted message queue.
- corrected a minor typo in the changelog.
- move htobe64/be64toh portability code to cachedb.c.
- iana port update.
- Do not use cached NSEC records to generate negative answers for
  domains under DNSSEC Negative Trust Anchors.
- Fix unbound-control get_option aggressive-nsec
- Check "result" in dup_all(), by Florian Obser.
- Fix #4043: make test fails due to v6 presentation issue in macOS.
- Fix unable to resolve after new WLAN connection, due to auth-zone
  failing with a forwarder set.  Now, auth-zone is only used for
  answers (not referrals) when a forwarder is set.
- Combine write of tcp length and tcp query for dns over tls.
- nitpick fixes in example.conf.
- Fix above stub queries for type NS and useless delegation point.
- Fix unbound-control over pipe with openssl 1.1.1, the TLSv1.3
  tls_choose_sigalg routine does not allow the ciphers for the pipe,
  so use TLSv1.2.
- Fix that flush_zone sets prefetch ttl expired, so that with
  serve-expired enabled it'll start prefetching those entries.
- Fix downstream auth zone, only fallback when auth zone fails to
  answer and fallback is enabled.
- Fix for max include depth for authzones.
- Fix memory free on fail for $INCLUDE in authzone.
- Fix that an internal error to look up the wrong rr type for
  auth zone gets stopped, before trying to send there.
- Fix auth zone target lookup iterator.
- Fix auth-zone retry timer to be on schedule with retry timeout,
  with backoff.  Also time a refresh at the zone expiry.
- Fix #658: unbound using TLS in a forwarding configuration does not
  verify the server's certificate (RFC 8310 support).
- For addr with #authname and no @port notation, the default is 853.
- man page documentation for dns-over-tls forward-addr '#' notation.
- removed free from failed parse case.
- Fix #4091: Fix that reload of auth-zone does not merge the zonefile
  with the previous contents.
- Delete auth zone when removed from config.
- makedist uses bz2 for expat code, instead of tar.gz.
- Fix #4092: libunbound: use-caps-for-id lacks colon in
  config_set_option.
- auth zone http download stores exact copy of downloaded file,
  including comments in the file.
- Fix sldns parse failure for CDS alternate delete syntax empty hex.
- Attempt for auth zone fix; add of callback in mesh gets from
  callback does not skip callback of result.
- Fix cname classification with qname minimisation enabled.
- Fix contrib/fastrpz.patch for this release.
- Fix auth https for libev.
- Fix memory leak when caching wildcard records for aggressive NSEC use
- Fix for crash in daemon_cleanup with dnstap during reload,
  from Saksham Manchanda.
- Also that for dnscrypt.