from there we cannot import runUnitTest using relative import, so import it from
its full path instead, and to prevent reloading runUnitTest (which has some
import side effects) in such case, we insert it in sys module.
Original patch from jm



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35098 20353a03-c40f-0410-a6d1-a30d3c3de9de