Revert "[CodeHealth] Migrate remainder of testing/ to Python3 compatible syntax"

This reverts commit 8defc6c6da91e4b7d7a686b7bb67658d9a5ebe55.

Reason for revert: Makes win-chrome fail:
https://ci.chromium.org/p/chrome/builders/try/win-chrome/4538

Original change's description:
> [CodeHealth] Migrate remainder of testing/ to Python3 compatible syntax
>
> and Pylint2.7, and fix resulting errors.
>
> Bug: 1262363
> Change-Id: I09628427dd4caf9d873f3b489b897054430f8567
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3557490
> Reviewed-by: Ben Pastene <[email protected]>
> Commit-Queue: Joshua Hood <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#996200}

Bug: 1262363
Change-Id: I74384a8cbd77e0db5adbbd5815d54e836472b756
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3607233
Auto-Submit: Sebastien Lalancette <[email protected]>
Reviewed-by: Ben Pastene <[email protected]>
Commit-Queue: Ben Pastene <[email protected]>
Cr-Commit-Position: refs/heads/main@{#996362}
NOKEYCHECK=True
GitOrigin-RevId: 53ef7d3a9b421c2fb8b8831a2f20bfbcc95d1428
diff --git a/rust_main_program.py b/rust_main_program.py
index a1f9520..080dd2b 100644
--- a/rust_main_program.py
+++ b/rust_main_program.py
@@ -11,7 +11,7 @@
 import subprocess
 import sys
 
-sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+sys.path.append(os.path.dirname(__file__))
 import exe_util
 import main_program
 import test_results
diff --git a/test_filtering.py b/test_filtering.py
index bc9c7ee..a386dd0 100644
--- a/test_filtering.py
+++ b/test_filtering.py
@@ -56,7 +56,8 @@
         """
         if self._is_prefix_match:
             return test_name.startswith(self._filter_text)
-        return test_name == self._filter_text
+        else:
+            return test_name == self._filter_text
 
     def is_exclusion_filter(self):
         """Rreturns whether this filter excludes (rather than includes) matching