[transaction] explicit Transaction cnxset attribute
The Transaction object have a lot more attribute that those previously declared
in __init__. They are just dynamically assigned in Session code.
This changeset explicit the ``cnxset`` and ``mode`` attribute declaration.
sync_schema_props_perms('EmailAddress')forsourceinrql('CWSource X WHERE X type "ldapuser"').entities():config=source.dictconfighost=config.pop('host',u'ldap')protocol=config.pop('protocol',u'ldap')source.cw_set(url=u'%s://%s'%(protocol,host))source.update_config(skip_unknown=True,**config)commit()