Updated openstack/openstack
Project: openstack/nova  1fdc4afa157887d45e2f326d7373a5b1e8ee7aeb

Enable flake8 F841 checking

This check looks to see whether a local variable
is unused. Fixed all of violators of said check.

Change-Id: I6ff349ca8d650ae7d6ebeeb116a1649b0db8f071