Merge pull request #13506 from rgacogne/ddist-proxy-protocol-ttls-tlv

dnsdist: Add an option to set the SSL proxy protocol TLV

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

diff --cc pdns/dnsdist.cc
Simple merge

diff --cc pdns/dnsdist.hh
Simple merge

diff --cc pdns/dnsdistdist/docs/reference/config.rst
Simple merge

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