[server/test] make unittest_migractions.py use new style cubes
MigrationTC used old cube layout in
cubicweb/server/test/data-migractions/cubes, move them to new style cubes as
"cubicweb_<cubename>" in "apphome" (cubicweb/server/test/data-migractions/)
which is added to PYTHONPATH by CubicWebTC.
%(distname)s (0.1.0-1) UNRELEASED; urgency=low
* initial release
-- %(author)s <%(author-email)s> %(rfc2822-date)s