GitLab

The $SYSTEMTESTTOP shell variable if often set to .. in various shell
scripts inside bin/tests/system/, but most of the time it is only
used one line later, while sourcing conf.sh. This hardly improves
code readability.

$SYSTEMTESTTOP is also used for the purpose of referencing
scripts/files living in bin/tests/system/, but given that the
variable is always set to a short, relative path, we can drop it and
replace all of its occurrences with the relative path without adversely
affecting code readability.

The rewrite of BIND 9 build system is a large work and cannot be reasonable
split into separate merge requests.  Addition of the automake has a positive
effect on the readability and maintainability of the build system as it is more
declarative, it allows conditional and we are able to drop all of the custom
make code that BIND 9 developed over the years to overcome the deficiencies of
autoconf + custom Makefile.in files.

This squashed commit contains following changes:

- conversion (or rather fresh rewrite) of all Makefile.in files to Makefile.am
  by using automake

- the libtool is now properly integrated with automake (the way we used it
  was rather hackish as the only official way how to use libtool is via
  automake

- the dynamic module loading was rewritten from a custom patchwork to libtool's
  libltdl (which includes the patchwork to support module loading on different
  systems internally)

- conversion of the unit test executor from kyua to automake ...

this restores functionality that was removed in commit 03be5a6b,
allowing named to search in authoritative zone databases outside the
current zone for additional data, if and only if recursion is allowed
and minimal-responses is disabled.

- add CHANGES note
- update copyrights and license headers
- add -j to the make commands in .gitlab-ci.yml to take
  advantage of parallelization in the gitlab CI process

4780.	[bug]		When answering ANY queries, don't include the NS
			RRset in the authority section if it was already
			in the answer section. [RT #44543]

                        no-auth and no-auth-recursive which suppress
                        adding the NS records to the authority section
                        as well as the associated address records for the
                        nameservers. [RT #42005]

                        lookups. [RT #42894]

4371.	[func]		New "minimal-any" option reduces the size of UDP
			responses for qtype ANY by returning a single
			arbitrarily selected RRset instead of all RRsets.
			Thanks to Tony Finch. [RT #41615]