tor_addr_parse is overly permissive

tor_addr_parse allows these surprising address formats:

[192.0.2.1] (IPv4 in square brackets) → 192.0.2.1
[11.22.33.44 (IPv4 with left square bracket only) → 11.22.33.4
[11:22::33:44 (IPv6 with left square bracket only) → 11:22::33:4
11:22::33:44: (IPv6 with trailing colon) → 11:22::33:44

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