[tune] Remove hack to serve pin requests off thread (#2680)

* nopin

* fix

python/ray/tune/function_runner.py

@@ -9,7 +9,6 @@ import traceback
 from ray.tune import TuneError
 from ray.tune.trainable import Trainable
 from ray.tune.result import TIMESTEPS_TOTAL
-from ray.tune.util import _serve_get_pin_requests
 
 
 class StatusReporter(object):
@@ -108,7 +107,6 @@ class FunctionRunner(Trainable):
                             self._default_config["script_min_iter_time_s"]))
         result = self._status_reporter._get_and_clear_status()
         while result is None:
-            _serve_get_pin_requests()
             time.sleep(1)
             result = self._status_reporter._get_and_clear_status()