Cleaned up block_till_stop in core.py

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.

homeassistant/core.py

@@ -48,6 +48,9 @@ _LOGGER = logging.getLogger(__name__)
 # Temporary to support deprecated methods
 _MockHA = namedtuple("MockHomeAssistant", ['bus'])
 
+# The exit code to send to request a restart
+RESTART_EXIT_CODE = 100
+
 
 class HomeAssistant(object):
     """Root object of the Home Assistant home automation."""
@@ -87,21 +90,17 @@ class HomeAssistant(object):
         self.services.register(
             DOMAIN, SERVICE_HOMEASSISTANT_RESTART, restart_homeassistant)
 
-        if os.name != "nt":
-            try:
-                signal.signal(signal.SIGTERM, stop_homeassistant)
-            except ValueError:
-                _LOGGER.warning(
-                    'Could not bind to SIGQUIT. Are you running in a thread?')
+        try:
+            signal.signal(signal.SIGTERM, stop_homeassistant)
+        except ValueError:
+            _LOGGER.warning(
+                'Could not bind to SIGTERM. Are you running in a thread?')
 
         while not request_shutdown.isSet():
-            try:
-                time.sleep(1)
-            except KeyboardInterrupt:
-                break
+            time.sleep(1)
 
         self.stop()
-        return request_restart.isSet()
+        return RESTART_EXIT_CODE if request_restart.isSet() else 0
 
     def stop(self):
         """Stop Home Assistant and shuts down all threads."""