Never use a mutable type as named parameters default value.

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@1243 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/tests/functional/__init__.py

@@ -248,7 +248,7 @@ class NEOCluster(object):
         cursor.close()
         sql_connection.close()
 
-    def start(self, except_storages=[]):
+    def start(self, except_storages=()):
         neoctl = self.neoctl
         assert len(self.process_dict)
         for process_list in self.process_dict.itervalues():