Policy Definition: https://github.com/openstack/keystone/blob/stable/rocky/etc/policy.v3cloudsample.json
Policy Mapping: https://github.com/openstack/keystone/blob/stable/rocky/doc/source/getting-started/policy_mapping.rst
Policy Definition: https://github.com/openstack/glance/blob/stable/rocky/etc/policy.json
Policy Mapping: https://github.com/openstack/glance/blob/stable/rocky/doc/source/admin/policies.rst