For both containers and classic deployments, allow to configure policy.json for all OpenStack APIs with new parameters (hash, empty by default). Example of new parameter: NovaApiPolicies. See environments/nova-api-policy.yaml for how the feature can be used. Note: use it with extreme caution. Partial-implement: blueprint modify-policy-json Change-Id: I1144f339da3836c3e8c8ae4e5567afc4d1a83e95