Do a basic write test against an HDFS cluster with Kerberos enabled. We
   * assume that if a basic write succeeds, more complex operations will also
   * succeed.
Do a basic write test against an HDFS cluster with Kerberos enabled. We
   * assume that if a basic write succeeds, more complex operations will also
   * succeed. | TestRollingFileSystemSinkWithSecureHdfs.java