kasp tests: fix wait for reconfig done
The wait until zones are signed after rndc reconfig is broken because the zones are already signed before the reconfig. Fix by having a different way to ensure the signing of the zone is complete. This does require a call to the "wait_for_done_signing" function after each "check_keys" call after the ns6 reconfig. The "wait_for_done_signing" looks for a (newly added) debug log message that named will output if it is done signing with a certain key.
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