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.
- add ddns-confgen command to generate
configuration text for named.conf
- add zone option "ddns-autoconf yes;", which
causes named to generate a TSIG session key
and allow updates to the zone using that key
- add '-l' (localhost) option to nsupdate, which
causes nsupdate to connect to a locally-running
named process using the session key generated
by named
[RT #19284]
