Add support for Tor's control socket

[erbesharat]

Is this a BUG REPORT or FEATURE REQUEST?:
feature

What happened:
Currently, we only support socks5 connection to the Tor daemon.

What you expected to happen:
Add support for control unix socket aka /var/lib/tor/control

How to reproduce it (as minimally and precisely as possible):
"Feature Request"

Anything else we need to know?:

Environment:

• Torproxy version: master