Optimized Ansible tasks in deplay-steps-tasks.yaml
Optimized Ansible tasks in deplay-steps-tasks.yaml

- do not use set_fact when a lookup can be done directly in the task
- use multi-line YAML for easier legibility
- ignore errors in file lookup plugin when file does not exist and set defaults

Change-Id: I832a2ec34f4ed4a87e30d0c88f4c60bcf2f4c151

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates