Prop 313: 8.1. Test IPv6 Relay Consensus Counts using Chutney

Test the IPv6 relay count script in proposal 313, using chutney networks.

Since chutney creates a limited number of relays, we also need to test these changes on consensuses from the public tor network. So we shouldn't spend much time testing the script with chutney.

See proposal 313, section 8.1, chutney tests part: https://gitweb.torproject.org/torspec.git/tree/proposals/313-relay-ipv6-stats.txt#n337

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