Add io.restriction_trackers_test to Python 3 test suite
Add io.restriction_trackers_test to Python 3 test suite

apache/beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,chamikaramj/beam,iemejia/incubator-beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam,robertwb/incubator-beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,robertwb/incubator-beam,robertwb/incubator-beam,markflyhigh/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,chamikaramj/beam,apache/beam,RyanSkraba/beam,apache/beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,apache/beam,RyanSkraba/beam,lukecwik/incubator-beam,markflyhigh/incubator-beam,chamikaramj/beam,markflyhigh/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,markflyhigh/incubator-beam,RyanSkraba/beam,robertwb/incubator-beam,markflyhigh/incubator-beam,lukecwik/incubator-beam,apache/beam,apache/beam,lukecwik/incubator-beam,chamikaramj/beam,robertwb/incubator-beam,markflyhigh/incubator-beam,lukecwik/incubator-beam,apache/beam,RyanSkraba/beam,RyanSkraba/beam,iemejia/incubator-beam,robertwb/incubator-beam,apache/beam,markflyhigh/incubator-beam,RyanSkraba/beam,chamikaramj/beam,RyanSkraba/beam