private boolean requestedQopContainsPrivacy() {
      Set<String> requestedQop =
        ImmutableSet.copyOf(Arrays.asList(saslProps.get(Sasl.QOP).split(",")));
      return requestedQop.contains("auth-conf");
    }
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