Remove pyflakes

Change-Id: I8adf38b8548d986e23c37911cc2ad09046ea740a
Reviewed-on: https://review.openstack.org/28876
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins