HTCondor engines dont stop when using SSHProxyEngineSetLauncher

I'm using SSHProxyEngineSetLauncher to start an ipcluster on a remote machine which uses condor.
When stopping SSHProxyEngineSetLauncher condor_q still shows ipengines in the queue.

I think this is because SSHProxyEngineSetLauncher kills the ssh connection which runs ipcluster.
With this approach the ipcluster is not able to correctly shut down and kill the engines.

Maybe it is possible the send a shutdown signal before killing the connection

Start at SSHProxyEngineSetLauncher and trace its shutdown path when it stops the remote ipcluster connection. Reproduce the case while checking condor_q, then verify that stopping the launcher causes the remote ipcluster to shut down and removes its ipengines from the queue before the SSH connection ends.

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