[StarCluster] loadbalance removes nodes one at a time

[Ryan G]

I'm using loadbalance to shrink my cluster after submitting a bunch of
jobs.  I noticed that StarClustser may identify a group of nodes that can
be shutdown.  It then shuts them down one by one by running each plugin for
every node.  Why not run the plugins once and remove the group of nodes at
the same time?  This seems a bit inefficient.
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