[ONOS-4636]YANG Grouping linking bug fix + YANG Code review comment fix

Change-Id: I68ee8dd08266a02593e217cef1a9bb010037d673
(cherry picked from commit 2ee9e7e892456543e0e5532f7b0de3774d42e561)
diff --git a/utils/yangutils/src/test/resources/interfilewithusesreferringtype/ietf-network.yang b/utils/yangutils/src/test/resources/interfilewithusesreferringtype/ietf-network.yang
new file mode 100644
index 0000000..3d96560
--- /dev/null
+++ b/utils/yangutils/src/test/resources/interfilewithusesreferringtype/ietf-network.yang
@@ -0,0 +1,14 @@
+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     container networks {
+         container network-types {
+           description
+             "Serves as an augmentation target.
+              The network type is indicated through corresponding
+              presence containers augmented into this container.";
+         }
+     }
+}