Updated openstack/openstack
Project: openstack-infra/devstack-gate  918360ea53fd64e1188991c779992ab041cc6346
null
Run df after gate

In order to make sure we aren't getting close to filling up disks lets
run 'df -h' after every devstack run and log the output.

Change-Id: Ia378cb68109af0af49e8fa45a784f54ef16f327c