Fixes #18549 - Don't rebuild already correct DNS entries #4297
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If we do so and try to recreate them right away ecreate_dns_record might
still see a valid entry due to zone transfer slowness or other caching
issues. In this case we'd end up without a DNS entry after all. So
intead do nothing if the entry is already good.
This is a forward port from a fix I applied to a local 1.10.x instance.
Signed-off-by: Guido Günther agx@sigxcpu.org