client: remove unused Storage.cleanup

neo/client/Storage.py

@@ -191,11 +191,6 @@ class Storage(BaseStorage.BaseStorage,
         # seems used only by FileStorage
         raise NotImplementedError
 
-    def cleanup(self):
-        # Used in unit tests to remove local database files.
-        # We have no such thing, so make this method a no-op.
-        pass
-
     def close(self):
         # WARNING: This does not handle the case where an app is shared by
         #          several Storage instances, but this is something that only

neo/tests/threaded/__init__.py

@@ -23,7 +23,6 @@ from ConfigParser import SafeConfigParser
 from contextlib import contextmanager
 from itertools import count
 from functools import partial, wraps
-from thread import get_ident
 from zlib import decompress
 from ..mock import Mock
 import transaction, ZODB

neo/tests/zodb/__init__.py

@@ -42,7 +42,6 @@ class ZODBTestCase(TestCase):
         self.open()
 
     def _tearDown(self, success):
-        self._storage.cleanup()
         try:
             if functional:
                 self.neo.stop()