I believe that this is incorrect and maybe the issue is not really as indicated 
in the description.  This is what would happen assuming my user kinit-ed as 
[email protected] and the auth-to-local rules translated that principal to 
"rlevas" - which is the default behavior when Ambari manages the auth-to-local 
rules and the configured realm is EXAMPLE.COM:

```
[rlevas@c7401 ~]$ hdfs dfs -ls /user
Found 4 items
drwxrwx---   - ambari-qa          hdfs          0 2018-08-03 21:27 
/user/ambari-qa
drwxrwxr-x   - oozie              hdfs          0 2018-08-03 23:16 /user/oozie
drwx------   - rlevas             hdfs          0 2018-09-06 13:39 /user/rlevas
drwx------   - [email protected] hdfs          0 2018-09-06 13:43 
/user/rlevas_princ
[rlevas@c7401 ~]$ hdfs dfs -ls /user/rlevas_princ
ls: Permission denied: user=rlevas, access=READ_EXECUTE, 
inode="/user/rlevas_princ":[email protected]:hdfs:drwx------
```

[ Full content available at: https://github.com/apache/ambari/pull/2256 ]
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