Start showing IPv6 relay addresses in the Tor circuit display

Closed illia-v requested to merge illia-v/torbutton:relays-ipv6 into master

Many relays use IPv6 nowadays.

I sometimes want to know what IP address an exit relay will use, then I take a look at the Tor circuit display. But the address displayed there does not always match the actual one since the display does not show IPv6 addresses that can be used by relays.

I tried adding the addresses to the window, but I didn't set up everything needed to test this. Please check this thoroughly 🙂

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