
As per the community goal of migrating the policy file format from JSON to YAML [1], we need to do two things: 1. Change the default value of '[oslo_policy] policy_file' config option from 'policy.json' to 'policy.yaml' with upgrade checks. 2. Deprecate the JSON formatted policy file on the project side via warning in documentation and release notes. [1] https://governance.openstack.org/tc/goals/selected/wallaby/migrate-policy-format-from-json-to-yaml.html Change-Id: I9ca5459a6968d93dee1bf24b3e0012a4cc7020b5