Evaluator: fix race condition in get_new_run_num
Evaluator: fix race condition in get_new_run_num

paultopia/auto-sklearn,jayhetee/auto-sklearn,hmendozap/auto-sklearn,alongwithyou/auto-sklearn,MLWave/auto-sklearn,aruneral01/auto-sklearn,automl/auto-sklearn,automl/auto-sklearn,hmendozap/auto-sklearn