deConz rewrite to use async await syntax (#13151)

* Rewrite to use async await syntax

* Fix hound comment

homeassistant/components/scene/deconz.py

@@ -4,8 +4,6 @@ Support for deCONZ scenes.
 For more details about this platform, please refer to the documentation at
 https://home-assistant.io/components/scene.deconz/
 """
-import asyncio
-
 from homeassistant.components.deconz import (
     DOMAIN as DATA_DECONZ, DATA_DECONZ_ID)
 from homeassistant.components.scene import Scene
@@ -13,8 +11,8 @@ from homeassistant.components.scene import Scene
 DEPENDENCIES = ['deconz']
 
 
-@asyncio.coroutine
-def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
+async def async_setup_platform(hass, config, async_add_devices,
+                               discovery_info=None):
     """Set up scenes for deCONZ component."""
     if discovery_info is None:
         return
@@ -34,15 +32,13 @@ class DeconzScene(Scene):
         """Set up a scene."""
         self._scene = scene
 
-    @asyncio.coroutine
-    def async_added_to_hass(self):
+    async def async_added_to_hass(self):
         """Subscribe to sensors events."""
         self.hass.data[DATA_DECONZ_ID][self.entity_id] = self._scene.deconz_id
 
-    @asyncio.coroutine
-    def async_activate(self):
+    async def async_activate(self):
         """Activate the scene."""
-        yield from self._scene.async_set_state({})
+        await self._scene.async_set_state({})
 
     @property
     def name(self):