[Py3] Get tools/testrunner/local closer to Py3

This modernizes python code without breaking Py2 compat.

Ran with command:

futurize --stage1 -w tools/testrunner

and manual fixup in statusfile_unittest.py to change to update import
path and change to absolute imports (similar to pool_unittest.py)

Bug: v8:9871
Change-Id: I8851e2188ef9285f2bd57cc07e959e22e1b05f6b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2252548Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68490}

tools/testrunner/local/statusfile.py

@@ -27,12 +27,13 @@
 
 # for py2/py3 compatibility
 from __future__ import print_function
+from __future__ import absolute_import
 
 import os
 import re
 
-from variants import ALL_VARIANTS
-from utils import Freeze
+from .variants import ALL_VARIANTS
+from .utils import Freeze
 
 # Possible outcomes
 FAIL = "FAIL"

tools/testrunner/local/statusfile_unittest.py

@@ -4,10 +4,17 @@
 # found in the LICENSE file.
 
 
+from __future__ import absolute_import
+import os
+import sys
 import unittest
 
-import statusfile
-from utils import Freeze
+TOOLS_PATH = os.path.dirname(os.path.dirname(os.path.dirname(
+    os.path.abspath(__file__))))
+sys.path.append(TOOLS_PATH)
+
+from testrunner.local import statusfile
+from testrunner.local.utils import Freeze
 
 
 TEST_VARIABLES = {

tools/testrunner/local/testsuite.py

@@ -223,7 +223,7 @@ class TestGenerator(object):
     return self
 
   def __next__(self):
-    return self.next()
+    return next(self)
 
   def next(self):
     return next(self._iterator)

tools/testrunner/local/utils.py

@@ -35,7 +35,7 @@ import os
 import platform
 import re
 import subprocess
-import urllib2
+import urllib
 
 
 ### Exit codes and their meaning.