[Bug 1841072] Re: test_reflection.CallbackEqualityTest.test_different_instance_callbacks fails on Python 3.8

[Balint Reczey]

This bug now blocks updating python-3-defaults.

** Also affects: python-oslo.utils (Ubuntu)
   Importance: Undecided
       Status: New

** Tags added: update-excuse

** Also affects: python3-defaults (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  test_reflection.CallbackEqualityTest.test_different_instance_callbacks
  fails on Python 3.8

Status in oslo.utils:
  New
Status in python-oslo.utils package in Ubuntu:
  New
Status in python3-defaults package in Ubuntu:
  New

Bug description:
  When running the unit test on Python 3.8, it fails with the following
  traceback:

  oslo_utils.tests.test_reflection.CallbackEqualityTest.test_different_instance_callbacks
  ---------------------------------------------------------------------------------------

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      b'Traceback (most recent call last):'
      b'  File "/tmp/oslo.utils/oslo_utils/tests/test_reflection.py", line 156, in test_different_instance_callbacks'
      b'    self.assertTrue(reflection.is_same_callback(b.b, c.b, strict=False))'
      b'  File "/tmp/oslo.utils/.tox/py38/lib/python3.8/site-packages/unittest2/case.py", line 702, in assertTrue'
      b'    raise self.failureException(msg)'
      b'AssertionError: False is not true'
      b''

  This is apparently caused by a behavior change in Python 3.8 due to
  [1]. I have confirmed the different behavior by running tests manually
  on 3.6, 3.7 (both return True) and 3.8.

  According to [2], only taskflow seems to be using that method now, and
  it is not changing the default value for the "strict" parameter.

  [1] - https://bugs.python.org/issue1617161
  [2] - http://codesearch.openstack.org/?q=is_same_callback&i=nope&files=&repos=

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