[ONOS-4351][ONOS-4524] Augment linking and defect fixed.

Change-Id: I7c8e8c90579eea4631e014c4906a543a3c249427
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangOutput.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangOutput.java
index e9fa9c3..97072cf 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangOutput.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangOutput.java
@@ -67,7 +67,8 @@
 /**
  * Represents data model node to maintain information defined in YANG output.
  */
-public class YangOutput extends YangNode implements YangLeavesHolder, Parsable, CollisionDetector {
+public class YangOutput extends YangNode
+        implements YangLeavesHolder, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of the output.