Updated openstack/openstack
Project: openstack/neutron  4a28612f60f863ac97d67d4ee48fe8ac8345966d

enable F402 check for flake8

The change removes the shadowed loop variables and enables F402 checking

Change-Id: I015797feec463ffb0b5e97229a6ec2c9a41df9de
Partial-Bug: 1329017