Description of problem:
When installing metrics-store according to the documentation and README, the first playbook (deploys metrics installer machine and metrics store machine] fails on the generate vars.yaml task due to missing newline in the vars.yaml.template.

Version-Release number of selected component (if applicable):
ovirt-engine-4.3.3.1-0.1.el7.noarch
ovirt-engine-metrics-1.3.0.1-1.el7ev.noarch

How reproducible:
Always

Steps to Reproduce:
1. install metrics according to documentation and README
2. Run the script 

ANSIBLE_JINJA2_EXTENSIONS="jinja2.ext.do" ./configure_ovirt_machines_for_metrics.sh   --playbook=ovirt-metrics-store-installation.yml --ask-vault-pass


Actual results:
Playbook fails:

TASK [/usr/share/ansible/roles/oVirt.metrics/roles/oVirt.origin-on-ovirt : Include vars.yaml file] *** fatal: [localhost]: FAILED! => {"ansible_facts": {}, "ansible_included_var_files": [], "changed": false, "message": "Syntax Error while loading YAML.\n did not find expected key\n\nThe error appears to have been in '/usr/share/ansible/roles/oVirt.metrics/roles/oVirt.origin-on-ovirt/files/vars.yaml': line 52, column 53, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n authorized_ssh_keys: \"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCyeSc7AvP0LYOZePA278HGBb48xi4WZ5MxeQTmL73a617uHMRTE+oSgQF7ZdoBXKF8ubMpE/nuJvM/hIwdik0LLuEZfbpgM3sX02veBIDcQ1Bs0By6+yNqzquDJ9O+JZvfXOPVl5a6qlaURzrsUnkAuVEyRiXo0Hu2Glk+umZBujrCQyVoZRZRTsT1BWTePp6CWiYVHwyxMIpkOVBwFcRAPrqSlmbPfBQHu6sZjYHM4GQes2TA1M5tmhA1AhG6J/EjVG9AA6NFKgIcjHi/PDMJkRh0kj5iSPhe/rvUjWPgyduyl72lXYmwrP04CBMxn4MPmxb2h9XIbVVd0a99TaLN\"\n root_password: \"{{ root_password }}\" custom_script: \"{{ cloud_init_script_bastion }}\"\n ^ here\nWe could be wrong, but this one looks like it might be an issue with\nmissing quotes. Always quote template expression brackets when they\nstart a value. For instance:\n\n with_items:\n - {{ foo }}\n\nShould be written as:\n\n with_items:\n - \"{{ foo }}\"\n"}

Expected results:
Playbook doesn't fail

Additional info: