private boolean useWrap() {
      String qop = (String) saslClient.getNegotiatedProperty(Sasl.QOP);
      return qop != null && !"auth".equalsIgnoreCase(qop);
    }
Create a ByteString from byte array without copying (wrap), and then set it as the payload
for the builder.
@param builder builder for HDFS DataTransferEncryptorMessage.
@param payload byte array of payload.
hbase-asyncfs/src/main/java/org/apache/hadoop/hbase/io/asyncfs/FanOutOneBlockAsyncDFSOutputSaslHelper.java