This commit converts the license handling to adhere to the REUSE
specification. It specifically:
1. Adds used licnses to LICENSES/ directory
2. Add "isc" template for adding the copyright boilerplate
3. Changes all source files to include copyright and SPDX license
header, this includes all the C sources, documentation, zone files,
configuration files. There are notes in the doc/dev/copyrights file
on how to add correct headers to the new files.
4. Handle the rest that can't be modified via .reuse/dep5 file. The
binary (or otherwise unmodifiable) files could have license places
next to them in <foo>.license file, but this would lead to cluttered
repository and most of the files handled in the .reuse/dep5 file are
system test files.
(cherry picked from commit 58bd26b6cf)
The synthesised CNAME is not supposed to be followed when the
QTYPE is CNAME or ANY as the lookup is satisfied by the CNAME
record.
(cherry picked from commit e980affba0)
CNAME between to served zones when recursion was
desired and available (RD=1, RA=1). Don't return
the CNAME target otherwise to prevent accidental
cache poisoning. [RT #47078]
Ondřej Surý
Mark Andrews
Ondřej Surý