Updated openstack/openstack
Project: openstack/nova  185eaafe9c4f2a954ae5905d02b037b34a440265
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Remove useless variable from libvirt/driver.py

There are some variables in libvirt/driver.py were never used, so
we can just remove them.

Change-Id: Ie29bfbeef8c185697aa94a6e05e67a70436302c8