[goal] Deprecate the JSON formatted policy file

As per the community goal of migrating the policy file
the format from JSON to YAML[1], we need to replace policy.json to
policy.yaml and remove deprecated policy.json.

[1]https://governance.openstack.org/tc/goals/selected/wallaby/migrate-policy-format-from-json-to-yaml.html

Change-Id: Iede5a9f0387baaf9c72bd060b59435ffaa76f1bd

handlers/main.yml

@@ -28,6 +28,15 @@
     - "Restart cinder services"
     - "venv changed"
 
+# NOTE (noonedeadpunk): Remove this task after Xena release
+- name: Remove obsoleted policy.json file
+  file:
+    path: "/etc/cinder/policy.json"
+    state: absent
+  listen:
+    - Restart cinder services
+    - venv changed
+
 - name: Start services
   service:
     name: "{{ item.service_name }}"

tasks/cinder_post_install.yml

@@ -63,20 +63,29 @@
     - cinder-config
     - cinder-post-install
 
-- name: Implement policy.json if there are overrides configured
-  copy:
-    content: "{{ cinder_policy_overrides | to_nice_json }}"
-    dest: "/etc/cinder/policy.json"
-  notify:
-    - Manage LB
-    - Restart cinder services
-    - Restart uwsgi services
+- name: Implement policy.yaml if there are overrides configured
+  config_template:
+    content: "{{ cinder_policy_overrides }}"
+    dest: "/etc/cinder/policy.yaml"
+    owner: "root"
+    group: "{{ cinder_system_group_name }}"
+    mode: "0640"
+    config_type: yaml
   when:
-    - cinder_policy_overrides != {}
+    - cinder_policy_overrides | length > 0
   tags:
     - cinder-config
     - cinder-policy-override
 
+- name: Remove legacy policy.yaml file
+  file:
+    path: "/etc/cinder/policy.yaml"
+    state: absent
+  when:
+    - cinder_policy_overrides | length == 0
+  tags:
+    - cinder-policy-override
+
 # NOTE(cloudnull): This is using "cp" instead of copy with a remote_source
 #                  because we only want to copy the original files once. and we
 #                  don't want to need multiple tasks.