YANG Grouping Linker Support

Change-Id: I2fec0c0bb4d1584e82ffba3228106897ccad2bf5
diff --git a/utils/yangutils/src/test/resources/DuplicateGroupingInModule.yang b/utils/yangutils/src/test/resources/DuplicateGroupingInModule.yang
index d18b166..ec01781 100644
--- a/utils/yangutils/src/test/resources/DuplicateGroupingInModule.yang
+++ b/utils/yangutils/src/test/resources/DuplicateGroupingInModule.yang
@@ -2,20 +2,23 @@
     yang-version 1;
     namespace http://huawei.com;
     prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
     grouping endpoint {
         leaf address {
-            type ip-address;
+            type P:ip-address;
         }
         leaf port {
-            type port-number;
+            type P:port-number;
         }
     }
     grouping endpoint {
         leaf address {
-            type ip-address;
+            type P:pip-address;
         }
         leaf port {
-            type port-number;
+            type P:port-number;
         }
     }
 }