YANG Grouping Linker Support

Change-Id: I2fec0c0bb4d1584e82ffba3228106897ccad2bf5
diff --git a/src/test/resources/GroupingInModule.yang b/src/test/resources/GroupingInModule.yang
index 7d513a4..77fef1f 100644
--- a/src/test/resources/GroupingInModule.yang
+++ b/src/test/resources/GroupingInModule.yang
@@ -2,6 +2,9 @@
     yang-version 1;
     namespace http://huawei.com;
     prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
     grouping endpoint {
         leaf address {
             type P:ip-address;