Fix network config in create_cloud_init_iso.yml

The tasks before this one set a fact `_network_data`, it was looking for
a defined `_network_config` in this task which is never set so
`cifmw_config_drive_networkconfig` end up being `None` even if we
defined network config in `cifmw_libvirt_manager_configuration`.

Jira: OSPRH-17107

Author: hjensas

roles/libvirt_manager/tasks/create_cloud_init_iso.yml

@@ -63,7 +63,7 @@
     _default_uuid: "{{ 99999999 | random(seed=vm) | to_uuid | lower }}"
     cifmw_config_drive_uuid: "{{ _uuid.stdout | default(_default_uuid) | trim}}"
     cifmw_config_drive_hostname: "{{ vm }}"
-    cifmw_config_drive_networkconfig: "{{ _network_config | default(None) }}"
+    cifmw_config_drive_networkconfig: "{{ _network_data | default(None) }}"
     cifmw_config_drive_userdata: "{{ _user_data }}"
   ansible.builtin.include_role:
     name: config_drive