Bug 1658296

Description of problem:
When installing metrics according to this guide: https://ovirt.org/documentation/metrics-install-guide/ the deploy_cluster.yml playbook fails on invalid option for include_tasks. 

Version-Release number of selected component (if applicable):
ansible 2.7.4
ovirt-engine-4.2.8-0.1.el7ev.noarch

How reproducible:
Always

Steps to Reproduce:
1. Do all task according to the guide until chapter "Running Ansible" step 5
2. Run:

ANSIBLE_LOG_PATH=/tmp/ansible.log ansible-playbook -vvv -e @/root/vars.yaml -i /root/ansible-inventory-ocp-latest-aio playbooks/deploy_cluster.yml

3. Fails with error:

fatal: [localhost]: FAILED! => {
    "reason": "Invalid options for include_tasks: component\n\nThe error appears to have been in '/usr/share/ansible/openshift-ansible/roles/openshift_logging/tasks/generate_certs.yaml': line 135, 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: Generate PEM certs\n  ^ here\n"
}

Failure summary:


  1. Hosts:    localhost
     Play:     OpenShift Aggregated Logging
     Task:     openshift_logging : include_tasks
     Message:  Failed without returning a message.



Actual results: Playbook fails


Expected results: 


Additional info: