* role information for Person, Assignment, and Bug were missing. the test looked working fine because self.login('dummy') meant loging in with manager account before.
* now a sender of a bug notification should be its owner.
* no need to add Manager role for 'dummy' user.
* use 'dummy' user in test_03_setCheckBugNotification too.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30220 20353a03-c40f-0410-a6d1-a30d3c3de9de