tor_addr_is_public_for_reject should return 0 for multicast addresses
This makes the treatment of addresses from other sources consistent with the implementation of get_interface_address6_list.
This might need to be cherry-picked to:
- #17027 (moved) (0.2.7)
- #17610 (moved) (0.2.6) But only once their implementations include tor_addr_is_public_for_reject.
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