Add more tests for kasp:
- Add tests for different algorithms.
- Add a test to ensure that an edit in an unsigned zone is
picked up and properly signed.
- Add two tests that ensures that a zone gets signed when it is
configured as so-called 'inline-signing'. In other words, a
secondary zone that is configured with a 'dnssec-policy'. A zone
that is transferred over AXFR or IXFR will get signed.
- Add a test to ensure signatures are reused if they are still
fresh enough.
- Adds two more tests to verify that expired and unfresh signatures
will be regenerated.
- Add tests for various cases with keys already available in the
key-directory.
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