Migrate to generic discovery method (#2271)

* Migrate to generic discovery method

* Add tests for discovery

homeassistant/components/sensor/__init__.py

@@ -8,35 +8,17 @@ import logging
 
 from homeassistant.helpers.entity_component import EntityComponent
 from homeassistant.helpers.config_validation import PLATFORM_SCHEMA  # noqa
-from homeassistant.components import (
-    wink, zwave, isy994, verisure, ecobee, tellduslive, mysensors,
-    bloomsky, vera, netatmo)
 
 DOMAIN = 'sensor'
 SCAN_INTERVAL = 30
 
 ENTITY_ID_FORMAT = DOMAIN + '.{}'
 
-# Maps discovered services to their platforms
-DISCOVERY_PLATFORMS = {
-    bloomsky.DISCOVER_SENSORS: 'bloomsky',
-    wink.DISCOVER_SENSORS: 'wink',
-    zwave.DISCOVER_SENSORS: 'zwave',
-    isy994.DISCOVER_SENSORS: 'isy994',
-    verisure.DISCOVER_SENSORS: 'verisure',
-    ecobee.DISCOVER_SENSORS: 'ecobee',
-    tellduslive.DISCOVER_SENSORS: 'tellduslive',
-    mysensors.DISCOVER_SENSORS: 'mysensors',
-    vera.DISCOVER_SENSORS: 'vera',
-    netatmo.DISCOVER_SENSORS: 'netatmo',
-}
-
 
 def setup(hass, config):
     """Track states and offer events for sensors."""
     component = EntityComponent(
-        logging.getLogger(__name__), DOMAIN, hass, SCAN_INTERVAL,
-        DISCOVERY_PLATFORMS)
+        logging.getLogger(__name__), DOMAIN, hass, SCAN_INTERVAL)
 
     component.setup(config)