Merge remote-tracking branch 'origin/master' into luarec

Merge remote-tracking branch 'origin/master' into luarec

* origin/master: (241 commits)
  ixfrdist: fix review comments by @rgacogne
  ixfrdist: don't use variable length array
  ixfrdist: reverse no source and ACL checks
  ixfrutil: ensure it does not print by itself
  ixfrdist: use the logging module
  logger: Allow logging with the severity prefix
  auth: Link dnspcap2protobuf against librt when needed
  Update metrics.rst
  requeue serial check if NOTIFY comes in while incoming AXFR is ongoing
  improve slave NOTIFY logging
  Add return 0 for correct exit of set-kind and set-account
  Test dependencies is too recent a feature, disable the uninit test
  rec: Set the RNG parameter to "auto" in the SyncRes unit tests
  Fix the dns_random unit tests, test all available backends
  make lock test pass on macOS
  ixfrdist: update manpage
  ixfrdist: Use workers to handle TCP connections
  Fix a warning on botan >= 2.5.0
  Fix compilation and use of getrandom() when available
  lualang.org -> lua.org
  ...