Add support for Isolating streams by socks authentication
My current prop171 branch doesn't handle isolating streams by socks authentication, because Tor doesn't handle or record socks authentication -- that's in the as-yet-unmerged #1666 (moved) branch.
Once we have merged both prop171 and on #1666 (moved), I should implement the ISO_CLIENTAUTH isolation flag as currently stubbed out in prop171.
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