I have the following situation:

I have direct ssh access to a login node. From the login node, I have ssh 
access to the actual compute nodes that I want to spawn workers on. I don't 
have access to these nodes directly from my machine. I usually do a two-hop 
ssh into workers via something like this:

ssh me@$LOGIN_NODE -t "ssh me@$WORKER_NODE"

Does the ssh stuff in Base support spawning workers like this? I looked at 
the `tunnel` option to addprocs but it doesn't look like there's a way to 
specify a machine to use as the first hop, which makes me suspect this is 
not what I'm looking for. If not how would I go about doing so? Write a 
ClusterManager for it?

Cheers,
James

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