Merge pull request #13522 from rgacogne/coverity-auto-copy-move-2

Fix unnecessary copies reported by Coverity (round 2)

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

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

diff --cc pdns/pdnsutil.cc
Simple merge

diff --cc pdns/sdig.cc
Simple merge