Pass tobiko.conf changes using a dictionary

Pass tobiko.conf via a dictionary where
sections are sub-dictionaries like below:

 section-1:
  option-1-1: value-1-1
  option-1-2: value-1-2

 section-2:
  option-2-1: value-2-1

Dictionary is flattered to a list before being
consumed to update tobiko.conf file like below:

 - section: section-1
   option: option-1-1
   value: value-1-1

 - section: section-1
   option: option-1-2
   value: value-1-2

 # etc.

Change-Id: I997a44de9ad4841197c8264a84039c034c823fe9

roles/tobiko/defaults/main.yaml

@@ -16,23 +16,13 @@ tobiko_user: "{{ ansible_user }}"
 
 # Configuration options
 tobiko_conf_file: /etc/tobiko/tobiko.conf
-tobiko_conf_options:
+tobiko_default_conf:
+  DEFAULT:
+    debug: "{{ tobiko_debug }}"
+    log_dir: "{{ tobiko_log_file | dirname }}"
+    log_file: "{{ tobiko_log_file | basename }}"
 
-  - section: DEFAULT
-    option: debug
-    value: "{{ tobiko_debug }}"
-
-  - section: DEFAULT
-    option: log_dir
-    value: "{{ tobiko_log_file | dirname }}"
-
-  - section: DEFAULT
-    option: log_file
-    value: "{{ tobiko_log_file | basename }}"
-
-  - section: keystone
-    option: cloud_name
-    value: "{{ tobiko_cloud_name }}"
+tobiko_conf: {}
 
 
 # Logging options
@@ -40,10 +30,6 @@ tobiko_debug: True
 tobiko_log_file: "{{ tobiko_dir }}/tobiko.log"
 
 
-# Keystone options:
-tobiko_cloud_name: ""
-
-
 # Output directories where tobiko should write to
 tobiko_output_dirs:
   - "{{ tox_dir }}"

roles/tobiko/tasks/pre/config.yaml

@@ -4,16 +4,32 @@
   become_user: root
   block:
 
+    - name: "flattern tobiko configuration"
+      set_fact:
+        tobiko_conf_yaml: |
+            {% for section, options in (sections.items() | sort)  %}
+            {% for option, value in (options.items() | sort)  %}
+            - section: "{{ section }}"
+              option: "{{ option }}"
+              value: "{{ value }}"
+            {% endfor %}
+            {% endfor %}
+      vars:
+        sections: "{{ tobiko_default_conf | combine(tobiko_conf) }}"
+
     - name: "provide {{ tobiko_conf_file }} file"
       ini_file:
         path: "{{ tobiko_conf_file }}"
-        section: '{{ item.section }}'
-        option: '{{ item.option }}'
-        value: '{{ item.value }}'
+        section: "{{ item.section }}"
+        option: "{{ item.option }}"
+        value: "{{ item.value }}"
         owner: root
         mode: '0644'
-      loop: "{{ tobiko_conf_options }}"
-      when: item.value
+      when:
+        - item.section
+        - item.option
+        - item.value
+      loop: "{{ tobiko_conf_yaml | from_yaml | list }}"
 
     - name: "read {{ tobiko_conf_file }} file"
       slurp: