identity ref issue fix in yang tools

Change-Id: If2d722fd98b714b879a82b7f66e586f31835ac4f
diff --git a/compiler/plugin/maven/src/test/resources/multipleIdentity/test.yang b/compiler/plugin/maven/src/test/resources/multipleIdentity/test.yang
new file mode 100644
index 0000000..05b4875
--- /dev/null
+++ b/compiler/plugin/maven/src/test/resources/multipleIdentity/test.yang
@@ -0,0 +1,21 @@
+module test {
+    namespace "identitytest";
+    prefix test ;
+
+    identity identity3;
+
+    identity identity2 {
+       base "identity3";
+    }
+
+    identity identity1 {
+       base "identity2";
+    }
+    container node {
+        leaf node-id{
+           type identityref {
+              base "identity1";
+           }
+        }
+    }
+}
\ No newline at end of file