Description of problem:

When running openshift-ansible/playbooks/redeploy-certificates.yml without setting values for "openshift_metrics_server_install" nor for "openshift_metrics_server_install", the playbook fails with the following error:

~~~
    "msg": "The conditional check 'openshift_metrics_server_install | bool' failed. The error was: error while evaluating conditional (openshift_metrics_server_install | bool): 'openshift_metrics_server_install' is undefined\n\nThe error appears to have been in '/home/quicklab/openshift-ansible/playbooks/metrics-server/private/redeploy-certificates.yml': line 13, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n  - name: Create temp directory for all our templates\n    ^ here\n"
}
~~~

Version-Release number of the following components:

$ rpm -q openshift-ansible
openshift-ansible-3.11.146-1.git.0.fcedb45.el7.noarch

$ rpm -q ansible
ansible-2.6.19-1.el7ae.noarch

$ ansible --version
ansible 2.6.19
  config file = /home/quicklab/ansible.cfg
  configured module search path = [u'/home/quicklab/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Jun 11 2019, 14:33:56) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]

How reproducible:

Steps to Reproduce:
1. Install latest 3.11.146 cluster with default metrics values (false)
2. Modify "openshift_master_cluster_public_hostname"
3. Run "openshift-ansible/playbooks/redeploy-certificates.yml"

Actual results:

TASK [Create temp directory for all our templates] *******************************************************************************************************************************************
task path: /home/quicklab/openshift-ansible/playbooks/metrics-server/private/redeploy-certificates.yml:13
fatal: [10.74.178.88]: FAILED! => {
    "msg": "The conditional check 'openshift_metrics_server_install | bool' failed. The error was: error while evaluating conditional (openshift_metrics_server_install | bool): 'openshift_metrics_server_install' is undefined\n\nThe error appears to have been in '/home/quicklab/openshift-ansible/playbooks/metrics-server/private/redeploy-certificates.yml': line 13, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n  - name: Create temp directory for all our templates\n    ^ here\n"
}

Expected results:

The workaround is to just set the following variables within the inventory or to pass them to the ansible-playbook command with "-e"

openshift_metrics_install_metrics=false
openshift_metrics_server_install=false (this second variable also fails when the first is fixed)

Additional info:

Verbose ansible-playbook (-vvv) logs are also attached.