GitLab

This tests both the cases when the DLV trust anchor is of an
unsupported or disabled algorithm, as well as if the DLV zone
contains a key with an unsupported or disabled algorithm.

Reduce code duplication by replacing a code snippet repeated throughout
system tests using "trusted-keys" and/or "managed-keys" configuration
sections with calls to keyfile_to_{managed,trusted}_keys() helper
functions.

- 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

3839.	[test]		Use only posix-compatible shell in system tests.
			[RT #35625]

3714.	[test]		System tests that need to test for cryptography
			support before running can now use a common
			"testcrypto.sh" script to do so. [RT #35213]

                        that validated insecure without using DLV and had
                        DS records in the parent zone. [RT #24631]

                        could be incorrectly marked as insecure instead of
                        secure leading to negative proofs failing.  This was
                        a unintended outcome from change 2890. [RT# 21392]