private Path getTestFile() {
    return new Path(testDirOnTestFs, "test");
  }
Sets up {@link MiniKdc} for testing security. Uses {@link HBaseKerberosUtils} to set the given
keytab file as {@link HBaseKerberosUtils#KRB_KEYTAB_FILE}.
hbase-asyncfs/src/test/java/org/apache/hadoop/hbase/io/asyncfs/TestSaslFanOutOneBlockAsyncDFSOutput.java