public void setKerberosEnabledTest(String kerberosEnabledTest) {
    this.kerberosEnabledTest = kerberosEnabledTest;
  }
Sets the JSON predicate ({@link PredicateUtils#fromJSON(String)} that can be used to determine
if Kerberos has been enabled for this service or not.

@param kerberosEnabledTest a valid JSON predicate ({@link PredicateUtils#fromJSON(String)}
ambari-server/src/main/java/org/apache/ambari/server/state/ServiceInfo.java