Bug 238629: dm-cmirror: Remote recovery conflict...
    
    The kernel changes are now in place (marking/clearing the log
    during writes to nosync regions) to allow nominal I/O to
    region that have yet to be recovered.
    
    Also moved around some debugging messages and removed
    'is_remote_recovering()'.  (is_remote_recovering is obviated by
    the new mechanism for handling recovery/write ordering.)