Policies are generated using oslopolicy-sample-generator
according to Horizon 'Policy file maintenance' guide [1].

[1]
https://docs.openstack.org/horizon/latest/contributor/topics/policy.html#policy-file-maintenance

Change-Id: If31c072ab14e1746969b7f94e6837722cefa28ea
Closes-Bug: #1821289
(cherry picked from commit 36170ed3)