[CI] Force config drive for ipv6 jobs

As our CI is ipv6 only and using cirros for tests.
Therefore we need to set force_config_drive = true.

Change-Id: I07058a4b30d0de1aaf8e82656024c5f6a99b290b

tests/run.yml

@@ -164,6 +164,7 @@
       become: "{{ item.become | default(false) }}"
       vars:
         is_previous_release: "{{ is_upgrade }}"
+        force_config_drive: "{{ 'true' if address_family == 'ipv6' else 'false' }}"
       with_items:
         # Ansible inventory
         - src: "tests/templates/inventory.j2"
@@ -647,6 +648,7 @@
             dest: "{{ item.dest }}"
           vars:
             is_previous_release: false
+            force_config_drive: "{{ 'true' if address_family == 'ipv6' else 'false' }}"
           with_items:
             # Ansible inventory
             - src: "tests/templates/inventory.j2"

tests/templates/nova-compute-overrides.j2

@@ -1,3 +1,5 @@
+[DEFAULT]
+force_config_drive = {{ force_config_drive }}
 [libvirt]
 {% if ansible_architecture == 'aarch64' %}
 cpu_mode = custom