port testBPMCore to the new simulation hierarchy.

* use different state than 'planned' as frozen state, to avoid unexpected isFrozen() value.
* use order business path.
* fix wrong assertions based on the wrong behaviour caused by the legacy simulation hierarchy.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34658 20353a03-c40f-0410-a6d1-a30d3c3de9de