Import ClientStorage earlier to avoid a spurious test warning about

leaving a thread behind.

src/ZODB/tests/testConfig.py

@@ -14,11 +14,11 @@
 
 import transaction
 import unittest
+import ZEO.ClientStorage
 import ZODB.config
 import ZODB.POSException
 import ZODB.tests.util
 
-
 class ConfigTestBase(ZODB.tests.util.TestCase):
         
     def _opendb(self, s):