Merge pull request #4518 from rgacogne/dnsdist-dynblock-action

dnsdist: Fix dynblocks over TCP, allow refusing dyn blocked queries

diff --cc pdns/README-dnsdist.md
Simple merge

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

diff --cc pdns/dnsdist-lua2.cc
Simple merge

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

diff --cc pdns/dnsdist.cc
Simple merge

diff --cc pdns/dnsdist.hh
Simple merge