Merge pull request #6359 from RobbeSneyders/transforms

[BEAM-5323] Finish Python 3 porting for utils module

Author: aaltay

Diff for: sdks/python/apache_beam/utils/retry.py

@@ -209,7 +209,6 @@ def wrapper(*args, **kwargs):
             # Traceback objects in locals can cause reference cycles that will
             # prevent garbage collection. Clear it now since we do not need
             # it anymore.
-            sys.exc_clear()
             exn_traceback = None
 
     return wrapper

Diff for: sdks/python/tox.ini

@@ -57,7 +57,7 @@ commands =
 setenv =
   BEAM_EXPERIMENTAL_PY3=1
 modules =
-  apache_beam.coders,apache_beam.tools
+  apache_beam.coders,apache_beam.tools,apache_beam.utils
 commands =
   python --version
   pip --version