Convert many kasp test cases to pytst

Convert many kasp test cases to pytst

Write python-based tests for the many test cases from the kasp system
test. These test cases all follow the same pattern:

- Wait until the zone is signed.
- Check the keys from the key-directory against expected properties.
- Set the expected key timings derived from when the key was created.
- Check the key timing metadata against expected timings.
- Check the 'rndc dnssec -status' output.
- Check the apex is signed correctly.
- Check a subdomain is signed correctly.
- Verify that the zone is DNSSEC correct.

Remove the counterparts for the newly added test from the kasp shell
tests script.

(cherry picked from commit 41481af1446ad3b0e319214b3ceee8805fd67e72)