HADOOP-16036. WASB: Disable jetty logging configuration announcement.

Contributed by Da Zhou.

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/AzureNativeFileSystemStore.java

@@ -403,6 +403,7 @@ public class AzureNativeFileSystemStore implements NativeFileSystemStore {
    * @return The JSON serializer.
    */
   private static JSON createPermissionJsonSerializer() {
+    org.eclipse.jetty.util.log.Log.getProperties().setProperty("org.eclipse.jetty.util.log.announce", "false");
     JSON serializer = new JSON();
     serializer.addConvertor(PermissionStatus.class,
         new PermissionStatusJsonSerializer());