Description of problem:

At present only oreg_url & openshift_node_labels works with ansible but passing docker registry options as below does not work :

----------
master.example.com openshift_node_labels="{'env': 'test', 'role':
'master'}"
oreg_url=gcloud-openshift_registry-openshift3_ose-${component}:${version}
docker_additional_registries='repo.example.com'
docker_blocked_registries='all'
----------

Manually modifying the code helps to use the parameters. Inaddtion to this, pre-pending with 'cli_' works. However, this is not user friendly and is also not recommended.

-------
master.example.com openshift_node_labels="{'env': 'test', 'role':
'master'}"
oreg_url=gcloud-openshift_registry-openshift3_ose-${component}:${version}
cli_docker_additional_registries='repo.example.com'
cli_docker_blocked_registries='all'
-------


Additional info:

docker registry parameters for the nodes should be added in a more user-friendly way or else a recommended solution for this would be great