device: skip DNS resolution for tentative IPv6 addresses

Merged Beniamino Galvani requested to merge bg/hostname-skip-ipv6-tentative into main

A tentative IPv6 address can still fail DAD, so don't use it to resolve the hostname via DNS. Furthermore, tentative addresses can't be used to contact the nameserver and so the resolution will fail if there is no other valid IPv6 address. Wait that the address becomes non-tentative.

NetworkManager-ci!1317 (merged)

Edited by Filip Pokryvka

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