Description of problem: For some reason, 3.11.123 prerequisites playbook does not seem to be setting the openshift_use_crio variable to the default of false when it is not explicitly defined in the inventory file, leading to these errors:

~~~
TASK [Verify SELinux is enabled] ***********************************************
task path: /usr/share/ansible/openshift-ansible/playbooks/init/sanity_checks.yml:42
fatal: [openshift.example.com]: FAILED! => {"msg": "The conditional check 'not openshift_use_crio | bool' failed. The error was: error while evaluating conditional (not openshift_use_crio | bool): 'openshift_use_crio' is undefined\n\nThe error appears to have been in '/usr/share/ansible/openshift-ansible/playbooks/init/sanity_checks.yml': line 42, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  # https://docs.openshift.com/container-platform/3.11/install/prerequisites.html#prereq-selinux\n  - name: Verify SELinux is enabled\n    ^ here\n"}
~~~


Version-Release number of the following components:
rpm -q openshift-ansible

openshift-ansible-3.11.123-1.git.0.db681ba.el7.noarch


rpm -q ansible

ansible-2.6.17-1.el7ae.noarch


How reproducible: I was not able to reproduce this after some simple testing, but I did check through the plays/tasks being run in my ansible logs vs customer ansible logs and did not see any significant difference between the plays/tasks run and the output between the two logs.

Additional info:

Will attach logs as private attachments