Merge pull request #15409 from rgacogne/ddist-ssl-switch-sni

dnsdist: Add support for switching certificates based on SNI w/ OpenSSL

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

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

diff --cc pdns/dnsdistdist/doh.cc
Simple merge

diff --cc pdns/dnsdistdist/doq-common.cc
Simple merge

diff --cc pdns/libssl.cc
Simple merge

diff --cc pdns/libssl.hh
Simple merge

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