[WifiBaseTest]Set all attenuators to 0 attn

Bug: None
Test: manual
Change-Id: I89e229cb3ca540cc39a1bb99dd7daacd68a60d13
diff --git a/acts/framework/acts/test_utils/wifi/WifiBaseTest.py b/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
index d2547df..151c792 100755
--- a/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
+++ b/acts/framework/acts/test_utils/wifi/WifiBaseTest.py
@@ -37,6 +37,8 @@
 class WifiBaseTest(BaseTestClass):
     def __init__(self, controllers):
         BaseTestClass.__init__(self, controllers)
+        for attenuator in self.attenuators:
+            attenuator.set_atten(0)
 
     def get_wpa2_network(
             self,