Description of problem:

openstack tripleo validator run --validation  nova-event-callback

openstack tripleo validator show run  84d0318e-9d0c-44eb-a5a3-ad3264aeab50

      {
            "task": {
                "hosts": {
                    "overcloud-controller-0": {
                        "_ansible_no_log": false,
                        "action": "validations_read_ini",
                        "changed": false,
                        "failed": true,
                        "invocation": {
                            "module_args": {
                                "default": null,
                                "ignore_missing_file": true,
                                "key": "vif_plugging_is_fatal",
                                "path": "/var/lib/config-data/puppet-generated/nova/etc/nova/nova.conf",
                                "section": "DEFAULT"
                            }
                        },
                        "msg": "The file '/var/lib/config-data/puppet-generated/nova/etc/nova/nova.conf' is not in a valid INI format."
                    }
                },
                "name": "Get vif_plugging_fatal value from nova.conf",
                "status": "FAILED"
            }
        }


Version-Release number of selected component (if applicable):
16.1.4

How reproducible:
100%

Additional info:
This validator fails on every controller.  Additionally, this key vif_plugging_is_fatal is defined on compute nodes too but it does not execute on those.