home-assistant: use SIGINT instead of SIGTERM to shut down
hass will ignore the standard SIGTERM sent by systemd during stop/restart and we then have to wait for the timeout after which systemd will forcefully kill the process. If instead if we send SIGINT, hass will shut down nicely. There are many issues reported upstream about the inability to shut down/restart and it is *supposed* to work with SIGTERM but doesn't.
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