Updated openstack/openstack
Project: openstack-infra/devstack-gate  4d0d57f51a227f75aea16fb81bbede2e583aede2
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Use the ephemeral disk on rackspace performance nodes

They don't come with swap, so match what we do for HP.

Change-Id: I4f81608c962bb7c1a03e7b5597759c1f40c0971c