Make address family search via UDP socket hack more accurate
The following address family search functions don't always return an IPv6 address:
- get_interface_address6_via_udp_socket_hack takes an address family as its first argument
- when get_interface_address6_list is passed AF_UNSPEC, it should be call get_interface_address6_via_udp_socket_hack with AF_INET, and then AF_INET6, and then both addresses should be returned
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