[tune] Fix trial result fetching (#4219)
[tune] Fix trial result fetching (#4219)

* Fix trial results wait in RayTrialExecutor.get_next_available_trial

* Add comment for the results shuffling

* Remove timeout from the wait

* Change random.sample to random.shuffle

stephanie-wang/ray,atumanov/ray,pcmoritz/ray-1,ray-project/ray,ray-project/ray,ujvl/ray-ng,ray-project/ray,richardliaw/ray,pcmoritz/ray-1,robertnishihara/ray,stephanie-wang/ray,robertnishihara/ray,stephanie-wang/ray,richardliaw/ray,pcmoritz/ray-1,robertnishihara/ray,robertnishihara/ray,robertnishihara/ray,ujvl/ray-ng,stephanie-wang/ray,stephanie-wang/ray,atumanov/ray,pcmoritz/ray-1,robertnishihara/ray,ray-project/ray,atumanov/ray,ray-project/ray,atumanov/ray,stephanie-wang/ray,richardliaw/ray,ray-project/ray,ray-project/ray,richardliaw/ray,robertnishihara/ray,richardliaw/ray,stephanie-wang/ray,atumanov/ray,ujvl/ray-ng,stephanie-wang/ray,atumanov/ray,stephanie-wang/ray,pcmoritz/ray-1,richardliaw/ray,ujvl/ray-ng,pcmoritz/ray-1,atumanov/ray,pcmoritz/ray-1,richardliaw/ray,pcmoritz/ray-1,richardliaw/ray,robertnishihara/ray,robertnishihara/ray,atumanov/ray,ray-project/ray