fix consumer metadata checking (#217)

diff --git a/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/src/test/java/org/apache/dubbo/samples/metadatareport/local/xml/MetadataIT.java b/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/src/test/java/org/apache/dubbo/samples/metadatareport/local/xml/MetadataIT.java
index e533c3a..b253132 100644
--- a/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/src/test/java/org/apache/dubbo/samples/metadatareport/local/xml/MetadataIT.java
+++ b/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/src/test/java/org/apache/dubbo/samples/metadatareport/local/xml/MetadataIT.java
@@ -131,6 +131,12 @@
      */
     @Test
     public void testConsumerMetadata() throws Exception {
+        //wait for metadata async report finish
+        try {
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+        }
+
         String result = ZkUtil.getMetadata("/dubbo3", DemoService.class.getName(), CommonConstants.CONSUMER_SIDE,
                 "metadatareport-local-xml-consumer2");
         Gson gson = new Gson();