=rem #3566 Fix failing RemoteNodeRestartDeathWatchSpec

I'm not completely sure that I have nailed it, but I will run this branch in a repeat job.
First I suspected that the "shutdown-ack" was never delivered, but from the logs I can see that the system is not shutdown. No trace of "Shutting down remote daemon". That means that it is the "shutdown" message that is not delivered, and therefore this retry-until-successful.