[Feature] Allow to restart the capture manager only

[Rafiot]

It is not super safe, but most of the time, the changes only apply to the process running the captures. Restarting this process only will most of the time be good enough and this way we won't trigger exceptions on the client side.

[Rafiot]

The somewhat quick and dirty solution right now is to send a kill signal 15 to the process, which will do the following:

• not starting any new captures
• wait for all the ongoing captures to finish
• quit

Usage:

pkill -15 capture_manager

[Rafiot]

Fixed: https://github.com/ail-project/lacus/commit/7cb9269cce6602431f45a72a8d3c96fdb8b69036