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

Change-Id: I7c8e8c90579eea4631e014c4906a543a3c249427
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangAugmentationHolder.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangAugmentationHolder.java
new file mode 100644
index 0000000..aa2b678
--- /dev/null
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangAugmentationHolder.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel;
+
+/**
+ * Represents YANG constructs which can be augmented.
+ */
+public interface YangAugmentationHolder {
+}
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangCase.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangCase.java
index e61d273..6787dc9 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangCase.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangCase.java
@@ -92,7 +92,7 @@
  * Represents data model node to maintain information defined in YANG case.
  */
 public class YangCase extends YangNode
-        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector {
+        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Case name.
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangChoice.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangChoice.java
index f05a11c..49a96d9 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangChoice.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangChoice.java
@@ -59,7 +59,8 @@
 /**
  * Represents data model node to maintain information defined in YANG choice.
  */
-public class YangChoice extends YangNode implements YangCommonInfo, Parsable, CollisionDetector {
+public class YangChoice extends YangNode
+        implements YangCommonInfo, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of choice.
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangContainer.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangContainer.java
index 5941837..3930433 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangContainer.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangContainer.java
@@ -87,7 +87,8 @@
 /**
  * Represents data model node to maintain information defined in YANG container.
  */
-public class YangContainer extends YangNode implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector {
+public class YangContainer extends YangNode
+        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of the container.
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangInput.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangInput.java
index 10f1ef4..4d7f2df 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangInput.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangInput.java
@@ -68,7 +68,8 @@
 /**
  * Represents data model node to maintain information defined in YANG input.
  */
-public class YangInput extends YangNode implements YangLeavesHolder, Parsable, CollisionDetector {
+public class YangInput extends YangNode
+        implements YangLeavesHolder, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of the input.
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangList.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangList.java
index e82132f..2b0bb53 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangList.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangList.java
@@ -68,7 +68,7 @@
  * Represents list data represented in YANG.
  */
 public class YangList extends YangNode
-        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector {
+        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of the YANG list.
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java
index e7b0241..5e81f64 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangNotification.java
@@ -74,8 +74,8 @@
 /**
  * Represents data model node to maintain information defined in YANG notification.
  */
-public class YangNotification extends YangNode implements YangLeavesHolder, YangCommonInfo, Parsable,
-        CollisionDetector {
+public class YangNotification extends YangNode
+        implements YangLeavesHolder, YangCommonInfo, Parsable, CollisionDetector, YangAugmentationHolder {
 
     /**
      * Name of the notification.
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.