Fix --load operation by reverting another side-effect of importing the Testing package

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30462 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/runUnitTest.py

@@ -314,6 +314,7 @@ def runUnitTestList(test_list, verbosity=1, debug=0):
   import App.config
   cfg = App.config.getConfiguration()
   cfg.testinghome = instance_home
+  cfg.instancehome = instance_home
   App.config.setConfiguration(cfg)
 
   if WIN: