Enable FAS for captive portal login

1. Make Cative portal page using dns query.
2. Fix forget network for Android S

Bug: 196323715
Test: local run
Change-Id: I82bc5729954eb1857e04e048bacf923ca5bc4738
diff --git a/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py b/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py
index 2e3f336..1729a7c 100755
--- a/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py
+++ b/acts_tests/acts_contrib/test_utils/wifi/wifi_test_utils.py
@@ -744,6 +744,7 @@
         "Failed to remove these configured Wi-Fi networks: %s" % networks)
 
 
+
 def toggle_airplane_mode_on_and_off(ad):
     """Turn ON and OFF Airplane mode.