KafkaBrokerResource enableSASL(String principal, String keytab) {
    this.principal = principal;
    this.keytab = keytab;
    return this;
  }
Enables SASL for broker using the principal and keytab provided.
<p>The method must be called before starting the KafkaServer (see {@link #before()}).</p>
@return the same broker resource with SASL setup enabled.
kafka-handler/src/test/org/apache/hadoop/hive/kafka/KafkaBrokerResource.java