add condrestart to the sysvinit script

We need to be able to condrestart all the ceph services on a
machine, so that we don't restart daemons that are supposed to be
stopped (e.g. broken disks).

Signed-off-by: Dan van der Ster <daniel.vanderster@cern.ch>
Merge pull request #468 from cernceph/condrestart

add condrestart to the sysvinit script

Reviewed-by: Sage Weil <sage@inktank.com>