Add VerifyAll to test methods using mox.

Missed this comment in an earlier review.

Change-Id: If9737a03ba003331d0e20288e3bbc09002c6dbdb

heat/tests/test_attributes.py

@@ -45,6 +45,7 @@ class AttributeTest(common.HeatTestCase):
                          "Unexpected attribute value")
         self.assertIsNone(test_attr.value,
                           "Second attrib value should be None")
+        self.m.VerifyAll()
 
     def test_as_output(self):
         """Test that Attribute looks right when viewed as an Output."""
@@ -71,6 +72,10 @@ class AttributesTest(common.HeatTestCase):
         "test3": "Test attrib 3"
     }
 
+    def setUp(self):
+        super(AttributesTest, self).setUp()
+        self.addCleanup(self.m.VerifyAll)
+
     def test_get_attribute(self):
         """Test that we get the attribute values we expect."""
         test_resolver = lambda x: "value1"