Clean up self.droid and self.ed from wifi test scripts.

Bug=27231417

Change-Id: I8780ea68ee3c5388c0f72828f51cdc89d1e9fc02
diff --git a/acts/tests/google/wifi/WifiEnterpriseTest.py b/acts/tests/google/wifi/WifiEnterpriseTest.py
index 45d8137..0f13a0c 100755
--- a/acts/tests/google/wifi/WifiEnterpriseTest.py
+++ b/acts/tests/google/wifi/WifiEnterpriseTest.py
@@ -124,24 +124,24 @@
         self.config_passpoint_ttls.update(self.config_passpoint)
         del self.config_passpoint_ttls[WifiEnums.SSID_KEY]
         # Set screen lock password so ConfigStore is unlocked.
-        self.droid.setDevicePassword(self.device_password)
+        self.dut.droid.setDevicePassword(self.device_password)
 
     def teardown_class(self):
         wutils.reset_wifi(self.dut)
-        self.droid.disableDevicePassword()
-        self.ed.clear_all_events()
+        self.dut.droid.disableDevicePassword()
+        self.dut.ed.clear_all_events()
 
     def setup_test(self):
-        self.droid.wifiStartTrackingStateChange()
-        self.droid.wakeLockAcquireBright()
-        self.droid.wakeUpNow()
+        self.dut.droid.wifiStartTrackingStateChange()
+        self.dut.droid.wakeLockAcquireBright()
+        self.dut.droid.wakeUpNow()
         wutils.reset_wifi(self.dut)
-        self.ed.clear_all_events()
+        self.dut.ed.clear_all_events()
 
     def teardown_test(self):
-        self.droid.wakeLockRelease()
-        self.droid.goToSleepNow()
-        self.droid.wifiStopTrackingStateChange()
+        self.dut.droid.wakeLockRelease()
+        self.dut.droid.goToSleepNow()
+        self.dut.droid.wifiStopTrackingStateChange()
 
     """Helper Functions"""