Controller/Deduplicate user supervision #172
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In the original implementation, the process is monitored by two supervisors, the original amoc_users_sup, and the amoc_controller one. But this means that bursts of ups and downs overflow the mailbox of two processes, one of them being actually the very critical controller.
With this reimplementation, only the amoc_users_sup tracks the processes, and all requests from the controller are asynchronous. This ensures the controller does not get blocked and can remain responsive to control requests.