1. Removed handling of KeyboardInterrupt. This will no longer happen
now that HASS is run in a subprocess. The KeyboardInterrupt will not be
sent to the parent process which will send a SIGTERM to the HASS
process.
2. Fixed logger warning about not being able to bind to SIGTERM.
3. Removed check for Windows OSs when binding to SIGTERM. This check
was originally put in place when HASS was binding to SIGQUIT. SIGTERM
exists in NT OSs, so the check is no longer required.
3. Now returning exit code of 100 when requesting a restart. This will
allow the parent process to only restart HASS if it is specifically
requested and not just on any encountered crash.
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