Allow IPv6 multicast to be disabled

name: Feature request
about: Allow IPv6 multicast to be disabled

Currently for kea-dhcp6 on FreeBSD, a socket is opened and bound to *:547 for multicast joining, regardless of how interfaces-config/interface is configured. I wish to use port 547 on another interface for health checking, but can't. Since I only use external unicast relays, I don't need the multicast functionality of kea-dhcp6, so it would be nice if there was an option to disable this.

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