Use voluptuous for mFi switch (#3168)

* Migrate to voluptuous

* Take change configuration into account

homeassistant/components/switch/mfi.py

@@ -7,43 +7,49 @@ https://home-assistant.io/components/switch.mfi/
 import logging
 
 import requests
+import voluptuous as vol
 
-from homeassistant.components.switch import DOMAIN, SwitchDevice
-from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
-from homeassistant.helpers import validate_config
+from homeassistant.components.switch import (SwitchDevice, PLATFORM_SCHEMA)
+from homeassistant.const import (
+    CONF_HOST, CONF_PORT, CONF_PASSWORD, CONF_USERNAME, CONF_SSL,
+    CONF_VERIFY_SSL)
+import homeassistant.helpers.config_validation as cv
 
 REQUIREMENTS = ['mficlient==0.3.0']
 
 _LOGGER = logging.getLogger(__name__)
 
+DEFAULT_PORT = 6443
+DEFAULT_SSL = True
+DEFAULT_VERIFY_SSL = True
+
 SWITCH_MODELS = [
     'Outlet',
     'Output 5v',
     'Output 12v',
     'Output 24v',
 ]
-CONF_TLS = 'use_tls'
-CONF_VERIFY_TLS = 'verify_tls'
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_HOST): cv.string,
+    vol.Required(CONF_USERNAME): cv.string,
+    vol.Required(CONF_PASSWORD): cv.string,
+    vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
+    vol.Optional(CONF_SSL, default=DEFAULT_SSL): cv.boolean,
+    vol.Optional(CONF_VERIFY_SSL, default=DEFAULT_VERIFY_SSL): cv.boolean,
+})
 
 
 # pylint: disable=unused-variable
 def setup_platform(hass, config, add_devices, discovery_info=None):
     """Setup mFi sensors."""
-    if not validate_config({DOMAIN: config},
-                           {DOMAIN: ['host',
-                                     CONF_USERNAME,
-                                     CONF_PASSWORD]},
-                           _LOGGER):
-        _LOGGER.error('A host, username, and password are required')
-        return False
-
-    host = config.get('host')
-    username = config.get('username')
-    password = config.get('password')
-    use_tls = bool(config.get(CONF_TLS, True))
-    verify_tls = bool(config.get(CONF_VERIFY_TLS, True))
-    default_port = use_tls and 6443 or 6080
-    port = int(config.get('port', default_port))
+    host = config.get(CONF_HOST)
+    username = config.get(CONF_USERNAME)
+    password = config.get(CONF_PASSWORD)
+    use_tls = config.get(CONF_SSL)
+    verify_tls = config.get(CONF_VERIFY_SSL)
+    default_port = use_tls and DEFAULT_PORT or 6080
+    port = int(config.get(CONF_PORT, default_port))
 
     from mficlient.client import FailedToLogin, MFiClient