default SaslClient createClient(Configuration conf, InetAddress serverAddr,
    String serverPrincipal, Token<? extends TokenIdentifier> token, boolean fallbackAllowed,
    Map<String, String> saslProps) throws IOException {
    String principalKey = "hbase.fake.kerberos.principal";
    conf.set(principalKey, serverPrincipal);
    return createClient(conf, serverAddr, new SecurityInfo(principalKey, Kind.HBASE_AUTH_TOKEN),
      token, fallbackAllowed, saslProps);
  }
Create the SASL client instance for this authentication method.
<p>
The default implementation is create a fake {@link SecurityInfo} and call the above method, for
keeping compatible with old customized authentication method
hbase-client/src/main/java/org/apache/hadoop/hbase/security/provider/SaslClientAuthenticationProvider.java