Enable Tor transparent proxy.

Added initial Tor configuration to enable transparent proxy. Based on this example:
https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy#LocalRedirectionandAnonymizingMiddlebox

There are still a few other things that will need to be done to actually use it though:
1. Firewall configuration to redirect outgoing traffic.
2. Probably need to disable other DNS servers when the redirection is switched on.