Move tor_bootstrap test into a separate file
tor_bootstrap: use test name as log file name

So that we can have more than one tor_bootstrap test.
Try to fetch a page after successfully bootstraping tor
Allow testing tor using different configs
Add the tor_bridge test

Try accessing Tor using a bridge
Add new test: tor_obfs3 (access tor using obfs3)
Add new test: tor_fte (access tor using fteproxy)