Only create an HttpClosedException when a go away frame was received …

…otherwise reuse the static shared instance.

src/main/java/io/vertx/core/http/impl/Http2ConnectionBase.java

@@ -147,7 +147,11 @@ void onStreamWritabilityChanged(Http2Stream s) {
   void onStreamClosed(Http2Stream s) {
     VertxHttp2Stream stream = s.getProperty(streamKey);
     if (stream != null) {
-      stream.onClose(new HttpClosedException(goAwayStatus));
+      if (goAwayStatus != null) {
+        stream.onClose(new HttpClosedException(goAwayStatus));
+      } else {
+        stream.onClose(HttpUtils.CLOSED_EXCEPTION);
+      }
     }
     checkShutdown();
   }