kasp: Expose more key timings
When doing rollover in a timely manner we need to have access to the relevant kasp configured durations. Most of these are simple get functions, but 'dns_kasp_signdelay' will calculate the maximum time that is needed with this policy to resign the complete zone (taking into account the refresh interval and signature validity). Introduce parent-propagation-delay, parent-registration-delay, parent-ds-ttl, zone-max-ttl, zone-propagation-delay.
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