[Bug 1796163] Fix proposed to oslo.config (stable/rocky)

[OpenStack Infra]

Fix proposed to branch: stable/rocky
Review: https://review.openstack.org/608235

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https://bugs.launchpad.net/bugs/1796163

Title:
  py3 failure cfg.py - dictionary changed size during iteration

Status in oslo.config:
  In Progress
Status in python-oslo.config package in Ubuntu:
  Fix Released
Status in python-oslo.config source package in Cosmic:
  Fix Released

Bug description:
  We came across the following issue while function testing keystone
  with py3: https://paste.ubuntu.com/p/d7s6KKPQDG/

    File "/usr/lib/python3/dist-packages/oslo_config/cfg.py", line 2652, in __iter__
      for key in itertools.chain(self._opts.keys(), self._groups.keys()):
  RuntimeError: dictionary changed size during iteration

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