fix reversed assignment

nova/tests/test_cloud.py

@@ -95,7 +95,7 @@ class CloudTestCase(test.TestCase):
         FLAGS.region_list = ["one=test_host1", "two=test_host2"]
         result = self.cloud.describe_regions(self.context)
         self.assertEqual(len(result['regionInfo']), 2)
-        regions = FLAGS.region_list
+        FLAGS.region_list = regions
 
     def test_describe_addresses(self):
         """Makes sure describe addresses runs without raising an exception"""