Openstack 17.1 Upgraded - node provision error/failure

Issue

• While performing a FFU from 16.2.6 to 17.1.8, we hit the following issue:

(undercloud) [stack@undercloud ~]$ openstack overcloud node provision --debug --stack overcloud --output /home/stack/templates/baremetal-deployment.yaml tripleo-overcloud-baremetal-deployment.yaml

Error - 

Using /tmp/tripleoakogl6a7/ansible.cfg as config file

host_list declined parsing /tmp/tripleoakogl6a7/hosts.yaml as it did not pass its verify_file() method

script declined parsing /tmp/tripleoakogl6a7/hosts.yaml as it did not pass its verify_file() method

Parsed /tmp/tripleoakogl6a7/hosts.yaml inventory source with yaml plugin

[WARNING]: Could not match supplied host pattern, ignoring: Controller

ERROR! Specified hosts and/or --limit does not match any hosts

Temporary directory [ /tmp/tripleoacc22fj3 ] cleaned up

Ansible execution failed. playbook: /usr/share/ansible/tripleo-playbooks/cli-overcloud-node-growvols.yaml, Run Status: failed, Return Code: 1

• The ansible inventory contains only the undercloud host in ~/overcloud-deploy/overcloud/tripleo-ansible-inventory.yaml:

Undercloud:
  hosts:
    undercloud: {}
  vars:
    ansible_connection: local
    ansible_host: localhost
    ansible_python_interpreter: /usr/bin/python3
    ansible_remote_tmp: /tmp/ansible-${USER}
    any_error_fatal: true
    auth_url: https://192.168.25.2:13000
    max_fail_percentage: 0
    plans: []
    project_name: admin
    undercloud_service_list:
    - tripleo_ironic_conductor
    username: admin