[ONOS-4799],[ONOS-4351] Augment inter file linker and Generated Code refactored.

Change-Id: Id1f3ac9c90a632373f51cc75d499c3110216be17
diff --git a/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/ResolvableType.java b/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/ResolvableType.java
index ad00cae..1be5cac 100644
--- a/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/ResolvableType.java
+++ b/utils/yangutils/datamodel/src/main/java/org/onosproject/yangutils/datamodel/ResolvableType.java
@@ -49,5 +49,10 @@
     /**
      * Identifies the identityref.
      */
-    YANG_IDENTITYREF
+    YANG_IDENTITYREF,
+
+    /**
+     * Identifies the augment.
+     */
+    YANG_AUGMENT
 }