- Merge #1078: Only check old pid if no username.

* nlnet/master: (35 commits)
  - Add unit test for validation of repeated use of a DNAME record.
  - Fix validation for repeated use of a DNAME record.
  - Fix typos for 'the the' in text.
  - Fix memory leak in setup of dsa sig.
  - Skip unbound-dnstap-socket unit test when not compiled with   --enable-debug.
  - Fix to squelch connection reset by peer errors from log. And fix   that the tcp read errors are labeled as initial for the first calls.
  - Fix memory leak on exit for unbound-dnstap-socket; creates false negatives   during testing.
  - Fix memory leak when reload_keep_cache is used and num-threads changes.
  - Enable AddressSanitizer error detection in tdir tests.
  - Fix for NLnetLabs#1079: fix RPZ taglist in iterator callback that no client   info is like no taglist intersection.
  - Fix NLnetLabs#1079: tags from tagged rpz zones are no longer honored after   upgrade from 1.19.3 to 1.20.0.
  Changelog note for NLnetLabs#1078. - Merge NLnetLabs#1078: Only check old pid if no username.
  Only check old pid if no username
  - Update patch to remove 'command' shell builtin and update error   text.
  unbound-control-setup: check openssl
  - Fix unused variable warning on compilation with no thread support.
  - Fix spelling of tcp-idle-timeout docs, from Michael Tokarev.
  - Fix to enable that SERVFAIL is cached, for a short period, for more   cases. In the cases where limits are exceeded.
  Changelog entry for NLnetLabs#1059: - Fix NLnetLabs#1059: Intermittent DNS blocking failure with local-zone and   always_nxdomain. Addition of local_zones dynamically via   unbound-control was not finding the zone's parent correctly.
  Proper parent identification for dynamically entered local zones (NLnetLabs#1076)
  ...