[Bug 1796163] Re: py3 failure cfg.py - dictionary changed size during iteration

[Corey Bryant]

I went with a minimal fix on this. There are other uses of d.keys() in
oslo.config but I'm not sure which ones modify the dictionary during
iteration. Could change all uses to list(d.keys()) but that would
somewhat defeat the purpose of the PEP.

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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:
  Triaged
Status in python-oslo.config source package in Cosmic:
  Triaged

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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