add more DNS64 default exclude acl tests (cherry picked from commit d147d56227b01ddb3568276d77727995ca3bd45d)
4409. [bug] DNS64 should exlude mapped addresses by default when a exclude acl is not defined. [RT #42810] (cherry picked from commit 557c7221fd4a7a439916e17d21405188c94a6aa1)
4401. [misc] Change LICENSE to MPL 2.0.
update copyright notice
[master] fix DNS64 with RPZ-remapped A records 3468. [security] RPZ rules to generate A records (but not AAAA records) could trigger an assertion failure when used in conjunction with DNS64. [RT #32141]
3013. [bug] The DNS64 ttl was not always being set as expected. [RT #23034]
2981. [func] Partial DNS64 support (AAAA synthesis). [RT #21991]