Description of problem:
Install OCP & CNS, the rhgs3/rhgs-server-rhel7 image is needed, which is from "registry.access.redhat.com". Installation failed due to the registry has been comment by installer.

Version-Release number of the following components:
openshift-ansible-3.7.0-0.128.0.git.0.89dcad2.el7
ansible-2.3.2.0-2.el7

How reproducible:
100%

Steps to Reproduce:
1. Install OCP & CNS
2.
3.

Actual results:
--------------------
Installation failed:
--------------------
ansible-playbook -i hosts -v /usr/share/ansible/openshift-ansible/playbooks/byo/config.yml
...
TASK [openshift_storage_glusterfs : Wait for GlusterFS pods] *******************
Wednesday 27 September 2017  08:11:18 +0000 (0:00:02.480)       0:12:15.248 *** 
FAILED - RETRYING: Wait for GlusterFS pods (30 retries left).
...
FAILED - RETRYING: Wait for GlusterFS pods (1 retries left).
fatal: [master.example.com]: FAILED! =>
...
----------------
Inside the node:
----------------
# ssh root@glusterfs-node-1.example.com
# docker pull rhgs3/rhgs-server-rhel7
Using default tag: latest
Trying to pull repository registry.example.com/rhgs3/rhgs-server-rhel7 ... 
Trying to pull repository docker.io/rhgs3/rhgs-server-rhel7 ... 
unauthorized: authentication required
# cat /etc/containers/registries.conf
...
#registries:
#  - registry.access.redhat.com

registries:
  - registry.example.com
...
------------------
According to code:
------------------
# cat roles/docker/templates/registries.conf
...
#registries:
#  - registry.access.redhat.com

{% if l2_docker_additional_registries %}
registries:
{% for reg in l2_docker_additional_registries %}
  - {{ reg }}
{% endfor %}
{% endif %}
...

Expected results:
Installer should keep "registry.access.redhat.com", then could pull image from it.

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