Commit 89a17f04 broke live tests using
ERP5TypeTestCase.publish when they are run from command line. Note that such
live test could not be run from ERP5.

More refactoring is needed because ERP5TypeLiveTestCase should only take care
of adapting ERP5TypeTestCaseMixin to an ERP5 environment, and runUnitTest
should never use it. Commit fd9219af looks a
wrong approach.