4401. [misc] Change LICENSE to MPL 2.0.
update copyrights
Make named a singleton process [RT#37908] Conflicts: bin/tests/system/conf.sh.in lib/dns/win32/libdns.def.in lib/isc/win32/file.c The merge also needed to update files in legacy and tcp system tests (newly introduced in master after branch was created) to introduce use of lockfile.
update copyright notice
reverse bad copyright update
2036. [bug] Check built-in zone arguments to see if the zone is re-usable or not. [RT #21914]