Chutney should verify IPv6 SOCKSPorts

Chutney will soon verify using client to relay IPv6, but verify only sends traffic to and from tor over IPv4.

We need to test the following:

• IPv6 SOCKSPorts,
• IPv4 and IPv6 SOCKSPorts with IPv6Traffic, and
• IPv6 Exits
• Hidden Services connecting to CHUTNEY_LISTEN_ADDRESS_V6:LISTEN_PORT