[session] explicitly take Connection object in close_cnx
Now that ClientConnection explicitly reference and use the Connection object we
do not need to use connectionid here.
We can safely change this signature, ClientConnection is the only use of
close_cnx for now.
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',)}