Description of problem:
Deploy CNS with glusterfs_registry group configure as registry storage failed due to attribute missing.
Installer failed in TASK [openshift_hosted : Mount registry volume].

Version-Release number of the following components:
openshift-ansible-3.9.0-0.38.0.git.0.57e1184.el7

How reproducible:
100%

Steps to Reproduce:
1. Deploy CNS with glusterfs_registry group configure as registry storage
# cat hosts
[OSEv3:children]
masters
nodes
glusterfs_registry
[OSEv3:vars]
...
openshift_hosted_registry_storage_kind=glusterfs
...
[nodes]
...
glusterfs1.example.com
glusterfs2.example.com
glusterfs3.example.com
[glusterfs_registry]
glusterfs1.example.com glusterfs_devices="['/dev/sdb']"
glusterfs2.example.com glusterfs_devices="['/dev/sdb']"
glusterfs3.example.com glusterfs_devices="['/dev/sdb']"
2.
3.

Actual results:
# ansible-playbook -i hosts -v /usr/share/ansible/openshift-ansible/playbooks/deploy_cluster.yml
...
TASK [openshift_hosted : Mount registry volume] ********************************
Tuesday 06 February 2018  09:48:33 +0000 (0:00:00.420)       0:36:10.525 ****** 
fatal: [ec2-xx-xx-xx-xx.compute-1.amazonaws.com]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'hosted'\n\nThe error appears to have been in '/usr/share/ansible/openshift-ansible/roles/openshift_hosted/tasks/storage/glusterfs.yml': line 34, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Mount registry volume\n  ^ here\n\nexception type: <class 'ansible.errors.AnsibleUndefinedVariable'>\nexception: 'dict object' has no attribute 'hosted'"}
...

Expected results:
Installer should success.

Additional info: