Fix race in test_shadow

Job order is not guaranteed in this test.

Change-Id: I2993d885384c2e7f8fb97d75199133b95e926b0a
diff --git a/tests/unit/test_v3.py b/tests/unit/test_v3.py
index 2b865cf..eae388b 100644
--- a/tests/unit/test_v3.py
+++ b/tests/unit/test_v3.py
@@ -699,4 +699,4 @@
         self.assertHistory([
             dict(name='test1', result='SUCCESS', changes='1,1'),
             dict(name='test2', result='SUCCESS', changes='1,1'),
-        ])
+        ], ordered=False)