Load/unload locative entities correctly between component and platform (#20498)

* Embed device_tracker in locative

* Load/unload locative entities correctly between component and platform

* Await the coroutine directly

* Await the correct coroutine

homeassistant/components/locative/device_tracker.py

@@ -0,0 +1,41 @@
+"""
+Support for the Locative platform.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/device_tracker.locative/
+"""
+import logging
+
+from homeassistant.components.device_tracker import \
+    DOMAIN as DEVICE_TRACKER_DOMAIN
+from homeassistant.components.locative import DOMAIN as LOCATIVE_DOMAIN
+from homeassistant.components.locative import TRACKER_UPDATE
+from homeassistant.helpers.dispatcher import async_dispatcher_connect
+
+_LOGGER = logging.getLogger(__name__)
+
+DEPENDENCIES = ['locative']
+
+DATA_KEY = '{}.{}'.format(LOCATIVE_DOMAIN, DEVICE_TRACKER_DOMAIN)
+
+
+async def async_setup_entry(hass, entry, async_see):
+    """Configure a dispatcher connection based on a config entry."""
+    async def _set_location(device, gps_location, location_name):
+        """Fire HA event to set location."""
+        await async_see(
+            dev_id=device,
+            gps=gps_location,
+            location_name=location_name
+        )
+
+    hass.data[DATA_KEY] = async_dispatcher_connect(
+        hass, TRACKER_UPDATE, _set_location
+    )
+    return True
+
+
+async def async_unload_entry(hass, entry):
+    """Unload the config entry and remove the dispatcher connection."""
+    hass.data[DATA_KEY]()
+    return True