private void sendParts(int session, FileReferenceData fileData) {
            ByteBuffer bb = ByteBuffer.allocate(0x100000);
            for (int partId = 0, read = fileData.nextContent(bb); read >= 0; partId++, read = fileData.nextContent(bb)) {
                byte [] buf = bb.array();
                if (buf.length != bb.position()) {
                    buf = new byte [bb.position()];
                    bb.flip();
                    bb.get(buf);
                }
                sendPart(session, fileData.fileReference(), partId, buf);
                bb.clear();
            }
        }
Returns true if empty sentinel config can be returned when a request from a host that is
not part of an application asks for sentinel config
configserver/src/main/java/com/yahoo/vespa/config/server/rpc/RpcServer.java