Change os.uname()[1] and socket.gethostname() to the portable and faster platform.node_ip() (#8839)

Co-authored-by: Mehrdad <noreply@github.com>

python/ray/tune/trainable.py

@@ -6,6 +6,7 @@ import logging
 import glob
 import os
 import pickle
+import platform
 import pandas as pd
 from six import string_types
 import shutil
@@ -308,7 +309,7 @@ class Trainable:
             time_this_iter_s=time_this_iter,
             time_total_s=self._time_total,
             pid=os.getpid(),
-            hostname=os.uname()[1],
+            hostname=platform.node(),
             node_ip=self._local_ip,
             config=self.config,
             time_since_restore=self._time_since_restore,

python/ray/tune/trial.py

@@ -3,6 +3,7 @@ from collections import deque
 import copy
 from datetime import datetime
 import logging
+import platform
 import shutil
 import uuid
 import time
@@ -42,7 +43,7 @@ class Location:
     def __str__(self):
         if not self.pid:
             return ""
-        elif self.hostname == os.uname()[1]:
+        elif self.hostname == platform.node():
             return "pid={}".format(self.pid)
         else:
             return "{}:{}".format(self.hostname, self.pid)