Filter TorMonitor access to tor control socket

In Tails, TorMonitor should only have access to a safe subset of Tor control protocol.

To get the conversation between TorMonitor and the Tor daemon: sudo socat -v UNIX-LISTEN:/tmp/tor-control-copy UNIX-CONNECT:/var/run/tor/control.

Currently TorMonitor uses:

- PROTOCOLINFO

- AUTHCHALLENGE SAFECOOKIE

- AUTHENTICATE

- SETEVENTS

- GETCONF __owningcontrollerprocess

- GETINFO version

- SETEVENTS SIGNAL

- SETEVENTS CONF_CHANGED SIGNAL STREAM CIRC

- GETINFO circuit-status

- GETINFO stream-status

- GETCONF usemicrodescriptors

- GETINFO ip-to-country/*
- GETINFO ns/id/*

Original created by @alant on 10058 (Redmine)

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