[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.

config_template has been choosen instead of the copy, since it can
properly handle content that has been lookuped.

We make a separate task not to restart service when it's not needed.

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

Change-Id: I701473f4d99e0be06dea494eee4f08212bb7d853

handlers/main.yml

@@ -23,6 +23,15 @@
   listen:
     - "venv changed"
 
+# NOTE (noonedeadpunk): Remove this task after Xena release
+- name: Remove obsoleted policy.json
+  file:
+    path: "/etc/ironic/policy.json"
+    state: absent
+  listen:
+    - "Restart ironic services"
+    - "venv changed"
+
 - name: Restart tftpd
   service:
     name: "{{ ironic_tftpd_service_name }}"

tasks/ironic_post_install.yml

@@ -120,12 +120,27 @@
     - Restart ironic services
     - Restart uwsgi services
 
-- name: Implement policy.json
-  copy:
-    content: "{{ ironic_policy_overrides | to_nice_json }}"
-    dest: "/etc/ironic/policy.json"
+- name: Implement policy.yaml
+  config_template:
+    content: "{{ ironic_policy_overrides }}"
+    dest: "/etc/ironic/policy.yaml"
+    owner: "{{ ironic_system_user_name }}"
+    group: "{{ ironic_system_group_name }}"
+    mode: "0644"
+    config_type: yaml
   when:
-    - ironic_policy_overrides != {}
+    - ironic_policy_overrides | length > 0
+  tags:
+    - ironic-policy-override
+
+- name: Remove legacy policy.yaml file
+  file:
+    path: "/etc/ironic/policy.yaml"
+    state: absent
+  when:
+    - ironic_policy_overrides | length == 0
+  tags:
+    - ironic-policy-override
 
 - name: Copy rootwrap filters
   copy: