Shutdown callback

[es-m-se]

Hi Guys,

After the recent upgrades to the python remote server many of my scripts stopped working. I had been overloading signal catching function to implement my own shutdown sequence. Many of my remote scripts were running multiple threads. In the new version that function disappeared.

I'd like to suggested this minor feature adding a shuddown_callback to the remote server. With this it is possible to run complex remotes and ensure they will stop properly.

Thanks for your consideration Shannon