Comment 13 for bug 1875418

Reviewed: https://review.opendev.org/748059
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=fe545dbe5fb434d5fce2d4d0f24c6c4a6bdd7d21
Submitter: Zuul
Branch: master

commit fe545dbe5fb434d5fce2d4d0f24c6c4a6bdd7d21
Author: Ghanshyam Mann <email address hidden>
Date: Thu Sep 3 14:25:43 2020 -0500

    Migrate default policy file from JSON to YAML

    Default value of 'CONF.oslo_policy.policy_file' config option
    has been changed from 'policy.json' to 'policy.yaml'. If new default
    file 'policy.yaml' does not exist but old default 'policy.json' exist
    then fallback to use old default file.

    An upgrade checks is added to check the policy_file format and
    fail upgrade checks if it is JSON formatted.

    Added a warning in policy doc about JSON formatted file is deprecated,
    also removed all the reference to policy.json file in doc as well as
    in tests.

    Related Blueprint: policy-json-to-yaml

    Closes-Bug: #1875418

    Change-Id: Ic4d3b998bb9701cb1e3ef12d9bb6f4d91cc19c18