openshift-ansible: missing OpenSSL python bindings

Description

Ansible failes wiht the message missing OpenSSL python bindings (on my master), although I have installed the pyOpenSSL package on my CentOS7 server.

Version

openshift-ansible-3.6.123.1002-1
ansible 2.3.1.0

Steps To Reproduce

1. inventory:

[OSEv3:children]
masters
nodes

[OSEv3:vars]
ansible_ssh_user=root
deployment_type=origin
openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}]
containerized=true
openshift_release=v1.5.1
openshift_image_tag=v1.5.1
openshift_public_hostname=master.domain.tld
openshift_master_default_subdomain=origin.domain.tld
openshift_hosted_metrics_deploy=true
openshift_disable_check=docker_storage,memory_availability

openshift_master_overwrite_named_certificates=true
openshift_master_named_certificates=[{"certfile": "/etc/letsencrypt/live/master.domain.tld/cert.pem", "keyfile": "/etc/letsencrypt/live/master.domain.tld/privkey.pem", "cafile": "/etc/letsencrypt/live/master.domain.tld/fullchain.pem"}]

[masters]
master.domain.tld openshift_schedulable=true

[nodes]
master.domain.tld openshift_node_labels="{'region': 'infra', 'zone': 'default'}" openshift_schedulable=true
node1.domain.tld openshift_node_labels="{'region': 'primary', 'zone': 'default'}" openshift_schedulable=true

1. ansible-playbook -i inventory openshift-ansible/playbooks/byo/config.yml

Observed Results

Failure summary:

  1. Host:     master.domain.tld
     Play:     Configure masters
     Task:     openshift_named_certificates : set_fact
     Message:  |missing OpenSSL python bindings

(of course using an actual domain.tld)