stack/erp5: fix NameError in IOS test
This repairs a NameError introduced in 397726e1 (erp5/neoppod/slapos: Support for python3 from aurel/zope4 branch., 2022-02-03) that was causing ERP5-IOS test suite to fail in loop.
This repairs a NameError introduced in 397726e1 (erp5/neoppod/slapos: Support for python3 from aurel/zope4 branch., 2022-02-03) that was causing ERP5-IOS test suite to fail in loop.