Merge pull request #4284 from rgacogne/dnsdist-response-delay

dnsdist: Add RCodeRule(), Allow, Delay and Drop response actions

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

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

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

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

diff --cc pdns/dnsdist.cc
Simple merge

diff --cc pdns/dnsdist.hh
Simple merge

diff --cc pdns/dnsrulactions.hh
Simple merge