Description of problem:
Upgrade against containerzied ocp on rhel failed at task[openshift_node : Pre-pull node system container image] due to atomic binary was not unavailable on the hosts.

TASK [openshift_node : Pre-pull node system container image] ****************************************************************************************************************
fatal: [qe-jliu-c39a-master-etcd-1]: FAILED! => {"msg": "The conditional check ''Pulling layer' in pull_result.stdout' failed. The error was: error while evaluating conditional ('Pulling layer' in pull_result.stdout): Unable to look up a name or access an attribute in template string ({% if 'Pulling layer' in pull_result.stdout %} True {% else %} False {% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable"}

# atomic --help
-bash: atomic: command not found

- name: Pre-pull node system container image
  command: >
    atomic pull --storage=ostree {{ system_osn_image }}
  register: pull_result
  retries: 3
  delay: 5
  until: pull_result.rc == 0
  changed_when: "'Pulling layer' in pull_result.stdout"


Version-Release number of the following components:
openshift-ansible-3.10.0-0.36.0.git.0.521f0ef.el7.noarch


How reproducible:
always

Steps to Reproduce:
1. Run upgrade against docker containerzied ocp on rhel(setting openshift_disable_check=docker_image_availability to workaround another issue)
2. 
3.

Actual results:
Upgrade failed.

Expected results:
Upgrade succeed.

Additional info:
Please attach logs from ansible-playbook with the -vvv flag