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

Change-Id: Id1f3ac9c90a632373f51cc75d499c3110216be17
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java
index 3847d3d..f63d8df 100644
--- a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java
@@ -161,6 +161,8 @@
                 ((YangReferenceResolver) yangNode)
                         .resolveInterFileLinking(ResolvableType.YANG_USES);
                 ((YangReferenceResolver) yangNode)
+                .resolveInterFileLinking(ResolvableType.YANG_AUGMENT);
+                ((YangReferenceResolver) yangNode)
                         .resolveInterFileLinking(ResolvableType.YANG_DERIVED_DATA_TYPE);
                 ((YangReferenceResolver) yangNode)
                         .resolveInterFileLinking(ResolvableType.YANG_LEAFREF);