Refactor all tests inheriting from WifiBaseTest as per b/137199892

Bug: 137199892
Test: manual
Change-Id: Ie6dbace7bfbd66aa02041a69d9421b0b012c60f4
diff --git a/acts/tests/google/wifi/WifiIOTTwPkg1Test.py b/acts/tests/google/wifi/WifiIOTTwPkg1Test.py
index b30c606..359560d 100644
--- a/acts/tests/google/wifi/WifiIOTTwPkg1Test.py
+++ b/acts/tests/google/wifi/WifiIOTTwPkg1Test.py
@@ -44,11 +44,9 @@
           * Wi-Fi IOT networks visible to the device
     """
 
-    def __init__(self, controllers):
-        self.attenuators = None
-        WifiBaseTest.__init__(self, controllers)
-
     def setup_class(self):
+        super().setup_class()
+
         self.dut = self.android_devices[0]
         wutils.wifi_test_device_init(self.dut)