Fixed some unit test issue.

1) 'output' property has been added to WF_EXECS.
2) In py34,'message' attrubute has been removed
   from exception class. So 'args[0]' has been
   used instead of 'message'.

Partially-Implements: blueprint mistral-py3

Change-Id: I626de3d9305f4f8d52bbeaf2b1094c9e96563cae

mistral/engine/rpc.py

@@ -228,7 +228,7 @@ class EngineServer(object):
 
 
 def _wrap_exception_and_reraise(exception):
-    message = "%s: %s" % (exception.__class__.__name__, exception.message)
+    message = "%s: %s" % (exception.__class__.__name__, exception.args[0])
 
     raise exc.MistralException(message)
 

mistral/tests/unit/api/v2/test_executions.py

@@ -210,7 +210,7 @@ class TestExecutionsController(base.FunctionalTest):
             WF_EX_JSON
         )
 
-        self.assertIn('Bad response: 400', context.message)
+        self.assertIn('Bad response: 400', context.args[0])
 
     @mock.patch.object(db_api, 'delete_workflow_execution', MOCK_DELETE)
     def test_delete(self):

mistral/tests/unit/api/v2/test_services.py

@@ -52,7 +52,7 @@ class TestServicesController(base.FunctionalTest):
             '/v2/services',
         )
 
-        self.assertIn('Service API is not supported', context.message)
+        self.assertIn('Service API is not supported', context.args[0])
 
     @mock.patch('mistral.coordination.ServiceCoordinator.get_members',
                 side_effect=tooz.coordination.ToozError('error message'))
@@ -70,5 +70,5 @@ class TestServicesController(base.FunctionalTest):
 
         self.assertIn(
             'Failed to get service members from coordination backend',
-            context.message
+            context.args[0]
         )

mistral/tests/unit/db/v2/test_sqlalchemy_db_api.py

@@ -683,6 +683,7 @@ WF_EXECS = [
         'task_id': None,
         'trust_id': None,
         'description': None,
+        'output': None
     },
     {
         'spec': {},
@@ -695,6 +696,7 @@ WF_EXECS = [
         'task_id': None,
         'trust_id': None,
         'description': None,
+        'output': None
     }
 ]