For example the kerberos.json file at 
`common-services/HDFS/2.1.0.2.0/kerberos.json` contains the following...

```
{
  "services": [
    {
      "name": "HDFS",
      "identities": [
        ...,
        {
          "name": "hdfs_smokeuser",
          "reference": "/smokeuser"
        }
      ],
      ...
```

This indicates the the smoke user's keytab file will be distributed to all 
hosts where a component of HDFS is installed. 

[ Full content available at: https://github.com/apache/ambari/pull/2247 ]
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