Updated openstack/openstack
Project: openstack/python-glanceclient  1db17aaad9a04cc98fc848b23a76db52a5f62965

Enable F841

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

Change-Id: Ic4dcac2733dfe334009327ac17aa3952cafaa63a