Declaring authorities with matching relay keys should fail

If a:

• hard-coded entry or
• config entry, tries to add:
• an authority,
• a bridge authority, or
• a fallback directory, with the same:
• relay key,
• v3ident key,
• IPv4 address and ORPort (matching any other IPv4 address and port), or
• IPv4 address and DirPort (matching any other IPv4 address and port),
• IPv6 address and ORPort (matching any other IPv6 address and port), or
• IPv6 address and (IPv4) DirPort (matching any other IPv6 address and port), as an existing entry, tor should warn and refuse to start.