Make check ha config file work with custom config dir

homeassistant/config.py

@@ -466,10 +466,9 @@ def async_check_ha_config_file(hass):
     import homeassistant.components.persistent_notification as pn
 
     proc = yield from asyncio.create_subprocess_exec(
-        sys.argv[0],
-        '--script',
-        'check_config',
-        stdout=asyncio.subprocess.PIPE)
+        sys.executable, '-m', 'homeassistant', '--script',
+        'check_config', '--config', hass.config.config_dir,
+        stdout=asyncio.subprocess.PIPE, loop=hass.loop)
     # Wait for the subprocess exit
     (stdout_data, dummy) = yield from proc.communicate()
     result = yield from proc.wait()