70.15 Enable Multiple Listeners with Undertow

Add an UndertowBuilderCustomizer to the UndertowEmbeddedServletContainerFactory and add a listener to the Builder:

_@Bean_
public UndertowEmbeddedServletContainerFactory embeddedServletContainerFactory() {
    UndertowEmbeddedServletContainerFactory factory = new UndertowEmbeddedServletContainerFactory();
    factory.addBuilderCustomizers(new UndertowBuilderCustomizer() {

        _@Override_
        public void customize(Builder builder) {
            builder.addHttpListener(8080, "0.0.0.0");
        }

    });
    return factory;
}