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huawei: fetch DHCPV6 info and generate link-local IPv6 for SLAAC

Oliver Kästner requested to merge okaestne/ModemManager:huawei-ipv6-linklocal-workaround into main

In continuation of !1079 (merged), this workaround allows NDIS-based Huawei modems (e.g. E3372) to get a working IPv6 configuration.

This uses the ^DHCPV6 command that returns only a global IPv6 address, which we can't use to set up the network interface. We need a proper link-local address to perform SLAAC and to get NetworkManager to use the returned DNS servers.

This workaround generates a random link-local address that can be used by the host for SLAAC.

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