Updated openstack/openstack
Project: openstack/oslo.config  36728094e2619e38a1edfd3d469ae6a9d859e630

Activate pep8 check that _ is imported

Currently translatable messages are not used, so there are no uses
of _.

This will ensure if _ is used in the future pep8 won't assume
it is provided as a builtin.

Change-Id: Id70f5447a8035b76ab69844cf716abd17e232091