Merge pull request #15842 from rgacogne/ddist20-backport-15823

dnsdist-2.0.x: Backport 15823 - Bring back listening on multiple web server addresses

diff --cc pdns/dnsdistdist/dnsdist-configuration-yaml.cc
Simple merge

diff --cc pdns/dnsdistdist/dnsdist-lua.cc
Simple merge

diff --cc pdns/dnsdistdist/dnsdist-settings-definitions.yml
Simple merge

diff --cc regression-tests.dnsdist/test_Yaml.py
Simple merge