"Implement" client Storage's cleanup method.

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@260 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/Storage.py

@@ -67,7 +67,9 @@ class Storage(BaseStorage.BaseStorage,
         return self.app.close()
 
     def cleanup(self):
-        raise NotImplementedError
+        # Used in unit tests to remove local database files.
+        # We have no such thing, so make this method a no-op.
+        pass
 
     def lastSerial(self):
         # does not seem to be used