Cleanup old device_tracker stuff (#8627)

* Cleanup old device_tracker stuff

* Fix lint

homeassistant/components/device_tracker/snmp.py

@@ -6,8 +6,6 @@ https://home-assistant.io/components/device_tracker.snmp/
 """
 import binascii
 import logging
-import threading
-from datetime import timedelta
 
 import voluptuous as vol
 
@@ -15,7 +13,6 @@ import homeassistant.helpers.config_validation as cv
 from homeassistant.components.device_tracker import (
     DOMAIN, PLATFORM_SCHEMA, DeviceScanner)
 from homeassistant.const import CONF_HOST
-from homeassistant.util import Throttle
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -28,8 +25,6 @@ CONF_BASEOID = 'baseoid'
 
 DEFAULT_COMMUNITY = 'public'
 
-MIN_TIME_BETWEEN_SCANS = timedelta(seconds=10)
-
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
     vol.Required(CONF_HOST): cv.string,
     vol.Optional(CONF_COMMUNITY, default=DEFAULT_COMMUNITY): cv.string,
@@ -68,9 +63,6 @@ class SnmpScanner(DeviceScanner):
                 privProtocol=cfg.usmAesCfb128Protocol
             )
         self.baseoid = cmdgen.MibVariable(config[CONF_BASEOID])
-
-        self.lock = threading.Lock()
-
         self.last_results = []
 
         # Test the router is accessible
@@ -90,7 +82,6 @@ class SnmpScanner(DeviceScanner):
         # We have no names
         return None
 
-    @Throttle(MIN_TIME_BETWEEN_SCANS)
     def _update_info(self):
         """Ensure the information from the device is up to date.
 
@@ -99,13 +90,12 @@ class SnmpScanner(DeviceScanner):
         if not self.success_init:
             return False
 
-        with self.lock:
-            data = self.get_snmp_data()
-            if not data:
-                return False
+        data = self.get_snmp_data()
+        if not data:
+            return False
 
-            self.last_results = data
-            return True
+        self.last_results = data
+        return True
 
     def get_snmp_data(self):
         """Fetch MAC addresses from access point via SNMP."""