Complete H2 reset promise as soon as the reset frame has been sent.

Motivation:

The recent changes in HTTP reset API introduced a returned future to signal when the stream reset is performed. The implementation completes the future when the stream reset has been written, instead we should complete it as soon as the frame is written.

Changes:

Complete the H2 reset future after the reset frame has been written.

vertx-core/src/main/java/io/vertx/core/http/impl/VertxHttp2Stream.java

@@ -325,12 +325,12 @@ protected void doWriteReset(long code, Promise<Void> promise) {
       streamId = stream != null ? stream.id() : -1;
     }
     if (streamId != -1) {
-      conn.handler.writeReset(streamId, code, (PromiseInternal<Void>) promise);
+      conn.handler.writeReset(streamId, code, null);
     } else {
       // Reset happening before stream allocation
       handleReset(code);
-      promise.complete();
     }
+    promise.complete();
   }
 
   void handleWriteQueueDrained() {