Updated openstack/openstack
Project: openstack/python-novaclient  ef420300e2aa06194dd8e7590455cd996babf4d4

Enable F841

F841 detects local variable is assigned to but never used.
This commit fix the violations and enable F841 in gate.

Change-Id: I52419f5e17db70e511ff2d4d61c85458c958e9c3