[server/test] stop using email cube
- make unittest_migractions use a separate datadir, and add a fake email
cube there (we use it to test {add,drop}_cube, so need something that
looks like a cube)
- for the other test modules, just copy what we need from cubicweb-email's
schema to our test schema
from cubicweb.schemas.base import in_group, CWSourceSchemaConfig
# copy __permissions__ to avoid modifying a shared dictionary
in_group.__permissions__ = in_group.__permissions__.copy()
in_group.__permissions__['read'] = ('managers',)
cw_for_source = CWSourceSchemaConfig.get_relation('cw_for_source')
cw_for_source.__permissions__ = {'read': ('managers', 'users'),
'add': ('managers',),
'delete': ('managers',)}