YANG sub module linking + unsupported yang construct + defect fix

Change-Id: I224c8c14ee2111f6844278cb540c48651544f59b
diff --git a/utils/yangutils/src/test/resources/RangeSubStatements.yang b/utils/yangutils/src/test/resources/RangeSubStatements.yang
new file mode 100644
index 0000000..4b57bd0
--- /dev/null
+++ b/utils/yangutils/src/test/resources/RangeSubStatements.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type int32 {
+            range "1..4 | 10..20" {
+                description "range description";
+                reference "range reference";
+            }
+         }
+    }
+}
+