Description of problem:
When installing metrics with this brew build ID: 863978

I get into an issue with missing IP of the metrics installer machine in task  "Set fact of the bastion machine FQDN". According to ovirt_vm_facs module (https://docs.ansible.com/ansible/latest/modules/ovirt_vm_facts_module.html), there is no 'ip' key in the returned value ovirt_vms (http://ovirt.github.io/ovirt-engine-api-model/master/#types/vm).


Version-Release number of selected component (if applicable):
ovirt-engine-4.3.2-0.1.el7.noarch
ovirt-engine-metrics-1.2.1-1.el7ev.noarch
ansible-2.7.9-1.el7ae.noarch


How reproducible:
Always


Steps to Reproduce:
1. On the Manager machine, copy /etc/ovirt-engine-metrics/config.yml.example to config.yml:
```
# cp /etc/ovirt-engine-metrics/metrics-store-config.yml.example /etc/ovirt-engine-metrics/config.yml.d/metrics-store-config.yml
```
2. Update the values of /etc/ovirt-engine-metrics/metrics-store-config.yml to match the details of your specific environment:
```
# vi /etc/ovirt-engine-metrics/config.yml.d/metrics-store-config.yml
```

3. Go to ovirt-engine-metrics repo:
```
# cd /usr/share/ovirt-engine-metrics
```

4. Run the metrics store installation playbook that creates the metrics store installer virtual machine
```
# ANSIBLE_JINJA2_EXTENSIONS="jinja2.ext.do" ./configure_ovirt_machines_for_metrics.sh --playbook=ovirt-metrics-store-installation.yml
```


Actual results:

TASK [/usr/share/ansible/roles/oVirt.metrics/roles/oVirt.origin-on-ovirt : Set fact of the bastion machine FQDN] ***
task path: /usr/share/ansible/roles/oVirt.metrics/roles/oVirt.origin-on-ovirt/tasks/create_openshift_bastion_vm.yml:20
fatal: [localhost]: FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'ip'\n\nThe error appears to have been in '/usr/share/ansible/roles/oVirt.metrics/roles/oVirt.origin-on-ovirt/tasks/create_openshift_bastion_vm.yml': line 20, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Set fact of the bastion machine FQDN\n  ^ here\n"
}


Expected results:
Task does not fail.

Additional info: