Updated openstack/openstack
Project: openstack-dev/devstack  abcc36e1214faebf567ce9f10e1d071faeb8c49a
null
reset prereqs status on clean.sh

when running a clean, we should really reset the prereq status as
well, as this should start us back from zeroish.

Change-Id: I5fae151ab13bcf7fb82feb1e91eed19e0215dc59