Refactor all tests inheriting from WifiBaseTest as per b/137199892

Bug: 137199892
Test: manual
Change-Id: Ie6dbace7bfbd66aa02041a69d9421b0b012c60f4
diff --git a/acts/framework/acts/test_utils/wifi/WifiBaseTest.py b/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
old mode 100755
new mode 100644
index ca9597f..cb7ab80
--- a/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
+++ b/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
@@ -40,9 +40,7 @@
 
 
 class WifiBaseTest(BaseTestClass):
-    def __init__(self, controllers):
-        if not hasattr(self, 'android_devices'):
-            BaseTestClass.__init__(self, controllers)
+    def setup_class(self):
         if hasattr(self, 'attenuators') and self.attenuators:
             for attenuator in self.attenuators:
                 attenuator.set_atten(0)