Merge branch 'work/rdatafields'
Conflicts: src/lib/dns/gen-rdatacode.py.in src/lib/dns/messagerenderer.cc src/lib/dns/messagerenderer.h src/lib/dns/name.h src/lib/dns/rdata.h src/lib/dns/rrtype-placeholder.h
Conflicts: src/lib/dns/gen-rdatacode.py.in src/lib/dns/messagerenderer.cc src/lib/dns/messagerenderer.h src/lib/dns/name.h src/lib/dns/rdata.h src/lib/dns/rrtype-placeholder.h