Merge pull request #7323 from rgacogne/dnsdist-check-timeout

dnsdist: Add an optional 'checkTimeout' parameter to 'newServer()'

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