#350 BootRefs don;t react or notify on local vat death

[Mark Samuel Miller]

Reported by Kevin Reid at
http://paste.lisp.org/display/37556

? def makeVat := <unsafe:org.erights.e.elib.vat.makeVat>
# value: <makeVat>

? def tv := makeVat.make("headless", "test")
# value: <Vat test in <runs in test>>

? def r := tv.seed(fn { def o; o })
# value: <Remote Promise>

? r <- __whenMoreResolved(fn x { println(`ding: $x`) })
# value: <Remote Promise>

? tv.orderlyShutdown("biff")
# value: <Promise>

? r
# value: <Remote Promise>