protected VertxEngineConfig getEngineConfig() {
        if (config().isEmpty()) {
            throw new IllegalStateException("No configuration provided!");
        }
        return new VertxEngineConfig(config());
    }
Maps to config.
@return Verticle's type
gateway/platforms/vertx3/vertx3/src/main/java/io/apiman/gateway/platforms/vertx3/verticles/ApimanVerticleBase.java