Updated openstack/openstack
Project: openstack-infra/devstack-gate  299ce250a1cd58d3fea6b96aafff3be590a4daeb

remove libvirt work around

libvirt in precise-updates now has the fix that we need (released
on March 20th), so we should no longer have to have a local work
around for it.

Change-Id: Id094a7e3e3004acd3d47b7fe34161ed2995e095b