[CORD-2080] Adding 'tosca_key' support in xproto

Change-Id: Ib01c1cdcb81a51819c9e08703e6c76a4ffa09f17
diff --git a/test/test_tosca_parser_e2e.py b/test/test_tosca_parser_e2e.py
index a4c8e29..87f3cf1 100644
--- a/test/test_tosca_parser_e2e.py
+++ b/test/test_tosca_parser_e2e.py
@@ -220,4 +220,4 @@
         with self.assertRaises(Exception) as e:
             parser.execute()
 
-        self.assertEqual(e.exception.message.message, "[XOS-TOSCA] Model Site:Open Networking Lab has property 'must-exist' but cannot be found")
+        self.assertEqual(e.exception.message.message, "[XOS-TOSCA] Model of class Site and properties {'name': 'Open Networking Lab'} has property 'must-exist' but cannot be found")