fuel-plugin-rally/deployment_scripts/puppet/modules/rally/templates/existing.json.erb

{
    "type": "ExistingCloud",
    "auth_url": "<%= @auth_url %>",
    "region_name": "RegionOne",
    "endpoint_type": "public",
    "admin": {
        "username": "<%= @username %>",
        "password": "<%= @password %>",
        "tenant_name": "<%= @tenant_name %>"
    },
    "https_insecure": true,
    "https_cacert": ""
}