YANG: Line number and character position addition for cardinality failure + Increase readability of Error message and function name

Change-Id: I467a536a9d2a6cbb29873491fdb0a91f211deefd
diff --git a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java
index 71a3042..dc5ff59 100644
--- a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java
+++ b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java
@@ -157,7 +157,7 @@
     @Test
     public void processUnitsStatementCardinality() throws IOException, ParserException {
         thrown.expect(ParserException.class);
-        thrown.expectMessage("YANG file error: Invalid cardinality of units in leaf \"invalid-interval\".");
+        thrown.expectMessage("YANG file error: \"units\" is defined more than once in \"leaf invalid-interval\".");
         YangNode node = manager.getDataModel("src/test/resources/UnitsStatementCardinality.yang");
     }