Merge pull request #11308 from omoerbeek/rec-save-parent-ns

rec: Remember parent NS set, to be able to fallback to it if needed

diff --cc pdns/rec_channel_rec.cc
Simple merge

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

diff --cc pdns/recursordist/rec-main.cc
Simple merge

diff --cc pdns/syncres.hh
Simple merge