cman init: increase default shutdown timeouts
    
    in some conditions, specially triggered when shutting down all nodes
    at the same time, corosync takes a lot longer than 10 seconds
    to stabilize membership. That means that daemons will not quit fast
    enough before cman init will declare a shutdown error.
    
    Increase the default shutdown timeouts from 10 to 30 seconds.
    
    Resolves: rhbz#854032
    
    Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
    Reviewed-by: Lon Hohberger <lhh@redhat.com>