Improve kasp test readability
This commit has a lot of updates on comments, mainly to make the system test more readable. Also remove some redundant signing policy checks (check_keys, check_dnssecstatus, check_keytimes). Finally, move key time checks and expected key time settings above 'rndc_checkds' calls (with the new way of testing next key event times there is no need to do them after 'rndc_checkds', and moving them above 'rndc_checkds' makes the flow of testing easier to follow.
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