Ticket 403 - CLEANALLRUV feature
    
    This is a rewrite of the first version of CLEANALLRUV.  The task is now an official slapi task, but the
    older/original method still works as well.  You can run multiple tasks(4) at the same time.  The task can handle
    situations where a replica is down, or "older"replicas are in the topology.  I've also added an "abort"
    task to cancel a particular cleanallruv task, as the task can potentially run for a long time while
    waiting for a server to come online or be cleaned.
    
    https://fedorahosted.org/389/ticket/403
    
    Reviewed by: richm & noriko (Thanks!)