Run the ceph-disk workunit with a mon setup with ceph-deploy. It is
prefered to the install done by the ceph tasks because it relies on the
init system and udev rules which are going to be tested by the ceph-disk
workunit.
http://tracker.ceph.com/issues/11881 Refs: #11881
Signed-off-by: Loic Dachary <loic@dachary.org>
