Merge pull request #7480 from pieterlexis/rec-throttle-fwd-recurse

rec: implement a way to disallow throtteling of auths

diff --cc pdns/pdns_recursor.cc
Simple merge

diff --cc pdns/rec_channel_rec.cc
Simple merge

diff --cc pdns/recursordist/docs/settings.rst
Simple merge

diff --cc pdns/recursordist/test-syncres_cc.cc
Simple merge

diff --cc pdns/syncres.hh
Simple merge