Add two test zones that will be reconfigured to go insecure, by
setting the 'dnssec-policy' option to 'none'.
One zone was using inline-signing (implicitly through dnssec-policy),
the other is a dynamic zone.
Two tweaks to the kasp system test are required: we need to set
when to except the CDS/CDS Delete Records, and we need to know
when we are dealing with a dynamic zone (because the logs to look for
are slightly different, inline-signing prints "(signed)" after the
zone name, dynamic zones do not).
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