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[#2819] Add ddns-ttl, ddsn-ttl-min, and ddns-ttl-max to kea-dhcpX

Thomas Markwalder requested to merge 2819-variant-add-ttl-params-to-kea-dhcpx into master

Rather than adding a global max value to D2, this MR is takes the approach of adding three new parameters:

ddns-ttl, ddns-ttl-min, ddns-ttl-max

to global,shared-network, and subnet to kea-dhcp4 and kea-dhcp6

The logic for calculating the DNS ttl is:

  1. If ddns-ttl is specified use it unconditionally.

  2. If ddns-ttl-percent is specified use it, otherwise use 1/3 as called for by RFC 4702. Calculate the candidate TTL based on the determined percentage.

  3. If ddns-ttl-min is specified use it otherwise use a minimum of 600 seconds per RFC 4702. If the calculated TTL is less than the minimum return the minimum.

  4. If ddns-ttl-max is specified limit the calculated TTL to that value.

  • support in kea-dhcp4
  • support in kea-dhcp6
  • doc update

CB Support will be done in a separate ticket (assuming this is accepted), possibly #3663

Closes #2819

Edited by Thomas Markwalder

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