Fix incomplete switch to policy.yaml (backport #1270)

[mergify]

This is an automatic backport of pull request #1270 done by Mergify.
Cherry-pick of 87ef6cd has failed:

On branch mergify/bp/stable/4.4/pr-1270
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Changes to be committed:
	modified:   gnocchi/cli/api.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   setup.cfg

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[jcapiitao]

oslo.policy is currently pin to 3.8.3 in Xena https://github.com/openstack/requirements/blob/6be7f21cdc8002f797b421303282ae3fd03af487/upper-constraints.txt#L487

So as a result this commit fails in RDO CI

[tobias-urdin]

Reverting in #1272