Lifx legacy (#6847)

* Add legacy LIFX platform for Windows support

The async platform introduced in 9ef084d903 has
turned out to use Python functionality that is not available in Windows.

This commit restores the previous implementation, now named lifx_legacy.

* Add a comment about the platform being a legacy implementation

* Warn when using unsupported lifx platform on Windows

* Update .coveragerc

homeassistant/components/light/lifx.py

@@ -7,6 +7,7 @@ https://home-assistant.io/components/light.lifx/
 import colorsys
 import logging
 import asyncio
+import sys
 from functools import partial
 from datetime import timedelta
 
@@ -51,6 +52,10 @@ def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
     """Setup the LIFX platform."""
     import aiolifx
 
+    if sys.platform == 'win32':
+        _LOGGER.warning('The lifx platform is known to not work on Windows. '
+                        'Consider using the lifx_legacy platform instead.')
+
     server_addr = config.get(CONF_SERVER)
 
     lifx_manager = LIFXManager(hass, async_add_devices)