jetty-9: HTTP client: always dispatching after connection creation.

This is needed to allow onOpen() to execute just after the connection creation,
otherwise the application may delay the onOpen() call indefinitely by implementing
a request listener method.

jetty-client/src/main/java/org/eclipse/jetty/client/HttpDestination.java

@@ -174,7 +174,7 @@ public class HttpDestination implements Destination, AutoCloseable, Dumpable
                     public void completed(Connection connection)
                     {
                         LOG.debug("Created connection {}/{} {} for {}", next, maxConnections, connection, HttpDestination.this);
-                        process(connection, client.isDispatchIO());
+                        process(connection, true);
                     }
 
                     @Override