string issue fix for few yang construct like config, mandatory + allowing yang constructs as identifers and string

Change-Id: I8dd01dc60d280a843b0a485681caa6bfcac013c2
diff --git a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java
index 6850425..984b0f2 100644
--- a/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java
+++ b/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java
@@ -141,7 +141,7 @@
     @Test
     public void processStatusInvalidValue() throws IOException, ParserException {
         thrown.expect(ParserException.class);
-        thrown.expectMessage("mismatched input 'invalid' expecting {'current', 'deprecated', 'obsolete'}");
+        thrown.expectMessage("Invalid content in status \"invalid\" before processing.");
         YangNode node = manager.getDataModel("src/test/resources/StatusInvalidValue.yang");
     }