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

  1. 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

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