add sleep test data loss

Author: chengyouling

common/common-rest/src/main/java/org/apache/servicecomb/common/rest/filter/inner/ServerRestArgsFilter.java

@@ -86,6 +86,11 @@ public CompletableFuture<Void> beforeSendResponseAsync(Invocation invocation, Ht
     if (isServerSendEvent(response)) {
       produceProcessor = new ProduceEventStreamProcessor();
       responseEx.setContentType(produceProcessor.getName() + "; charset=utf-8");
+      try {
+        Thread.sleep(10000);
+      } catch (InterruptedException e) {
+        throw new RuntimeException(e);
+      }
       return writeServerSendEvent(invocation, response, produceProcessor, responseEx);
     }