Allow to override blazar policy files

We implement `blazar_policy_overrides` variable in order to allow
management of balazar policy files when needed.

Change-Id: I581a9c9659d3d023eb40cf2c6dfc2d01fa0a7464

defaults/main.yml

@@ -139,6 +139,7 @@ blazar_program_name: blazar-server
 
 ## Tunable overrides
 blazar_blazar_api_paste_ini_overrides: {}
+blazar_policy_overrides: {}
 blazar_blazar_conf_overrides: {}
 blazar_api_init_config_overrides: {}
 blazar_manager_init_config_overrides: {}

releasenotes/notes/blazar_policy_overrides-49b609243d3afdf6.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added variable ``blazar_policy_overrides`` that aims to allow deploying
+    policy.yaml file with provided overrides for Blazar service.

tasks/blazar_post_install.yml

@@ -16,17 +16,23 @@
 
 - name: Deploy configuration files
   config_template:
-    src: "{{ item.src }}"
+    src: "{{ item.src | default(omit) }}"
     dest: "{{ item.dest }}"
     owner: "root"
     group: "{{ blazar_system_group_name }}"
     mode: "0640"
-    config_overrides: "{{ item.config_overrides }}"
+    config_overrides: "{{ item.config_overrides | default(omit) }}"
+    content: "{{ item.content | default(omit) }}"
     config_type: "{{ item.config_type }}"
+  when: item.condition | default(True)
   with_items:
     - src: "blazar.conf.j2"
       dest: "{{ blazar_etc_dir }}/blazar.conf"
       config_overrides: "{{ blazar_blazar_conf_overrides }}"
       config_type: "ini"
+    - dest: "{{ blazar_etc_dir }}/policy.yaml"
+      content: "{{ blazar_policy_overrides }}"
+      config_type: "yaml"
+      condition: "{{ (blazar_policy_overrides) }}"
   notify:
-    - Restart blazar services
+    - Restart blazar services