Merge pull request #3364 from TomasTomecek/3355-detailed-error-messages

service: detailed error messages for create and start

tests/integration/service_test.py

@@ -738,7 +738,10 @@ class ServiceTest(DockerClientTestCase):
 
         self.assertEqual(len(service.containers()), 1)
         self.assertTrue(service.containers()[0].is_running)
-        self.assertIn("ERROR: for composetest_web_2  Boom", mock_stderr.getvalue())
+        self.assertIn(
+            "ERROR: for composetest_web_2  Cannot create container for service web: Boom",
+            mock_stderr.getvalue()
+        )
 
     def test_scale_with_unexpected_exception(self):
         """Test that when scaling if the API returns an error, that is not of type