Follow new infra setup for translations, see spec http://specs.openstack.org/openstack-infra/infra-specs/specs/translation_setup.html for full details. This basically renames oslo.db/locale/oslo.db.pot to oslo_db/locale/oslo_db.pot. For this we need to update setup.cfg. Update also domain name in _i18n.py. Change-Id: I5b3052f840201557f3b1c85effeda3bb3318a9ee