Fix GroupIntoBathces.test_buffering_timer_in_fixed_window_streaming
Fix GroupIntoBathces.test_buffering_timer_in_fixed_window_streaming

apache/beam,robertwb/incubator-beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,apache/beam,robertwb/incubator-beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,robertwb/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,apache/beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,robertwb/incubator-beam,lukecwik/incubator-beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,apache/beam