[BUG] java-vertx-web uses internal HttpStatusException vertx class

Created by: indiketa

The vertx generator is using io.vertx.ext.web.handler.impl.HttpStatusException in each method default implementation.

example:

import io.vertx.ext.web.handler.impl.HttpStatusException;

import java.util.List;
import java.util.Map;

// Implement this class

public class BusinessApiImpl implements BusinessApi {
    public Future<ApiResponse<Void>> deleteCompanyId(String q, Integer id) {
        return Future.failedFuture(new HttpStatusException(501));
    }

This class was internal: Since vertx 4.1 this class is part of vertx official API and has changed to io.vertx.ext.web.handler.HttpException, code generated with java-vertx-web is uncompilable in the stable vertx versions.