Restrict the tor CI stem job to tests that actually use tor
From https://trac.torproject.org/projects/tor/ticket/30653?replyto=2#comment:2
- Tests tor/stem interoperability. This is the only thing the network team has cause to care about. For this I'd suggest running python 3.x with...
run_tests.py --integ --test control.controller --test control.base_controller --test process