RaceConditionBase.tearDown(): this neglected to call the base class's

tearDown().  One result is that all tests here except the first died
on Windows with a winlock.error; this is probably unique to lock semantics
on Windows, and doesn't show up at all unless you've installed a modern
Berkeley DB on Windows (unless you do that, these tests don't even try
to run on Windows).

lib/python/BDBStorage/tests/test_autopack.py

@@ -280,6 +280,7 @@ class RaceConditionBase(BerkeleyTestBase):
     def tearDown(self):
         # clean up any outstanding transactions
         get_transaction().abort()
+        BerkeleyTestBase.tearDown(self)
 
     def _getPackThread(self, storage):
         raise NotImplementedError