Implement SLAAC (stateless IPv6 configuration) daemon
This is an experiment we (@fdupont, @godfryd, @tomek) did during a hackathon in Prague. For details, see
https://gitlab.isc.org/isc-projects/kea/wikis/hackathon/slaac.
This ticket is created to slowly evolve the code into something that could one day be accepted as experimental feature in Kea.
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