Http2 default option tuning and pool usage tweaks

src/main/java/examples/HTTP2Examples.java

@@ -284,7 +284,9 @@ public class HTTP2Examples {
 
   public void useMaxStreams(Vertx vertx) {
 
-    HttpClientOptions clientOptions = new HttpClientOptions().setMaxStreams(10).setMaxPoolSize(3);
+    HttpClientOptions clientOptions = new HttpClientOptions().
+        setHttp2MaxStreams(10).
+        setHttp2MaxPoolSize(3);
 
     // Uses up to 3 connections and up to 10 streams per connection
     HttpClient client = vertx.createHttpClient(clientOptions);