DDNS TTL value is does not meet 4702, Section 5

This was originally opened in trac:

But somehow did not get migrated.

Currently the value used as TTL in DNS RRs is TTL directly from the lease (valid lease lifetime). Per 4702/Section 5 it should be be:

 RR TTL = ((lease TTL / 3)  < 10 minutes) ? 10 minutes : (lease TTL / 3)

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