Prop 311: 6.1. Test IPv6 ORPort Reachability using Chutney
Test the IPv6 ORPort Reachability and Extends changes in proposal 311, using chutney networks with AssumeReachable disabled.
(Chutney currently enables AssumeReachable by default.)
See proposal 311, section 6.1: https://gitweb.torproject.org/torspec.git/tree/proposals/311-relay-ipv6-reachability.txt#n671
Chutney already implements some of these tests, but we still need a fix for a bridge descriptor upload bug, see tor legacy/trac#33582 (moved) and chutney legacy/trac#33407 (moved).