[autotest] network_WiFi_Reset: clean up router when done

Most network_WiFi_* tests get this automagically, because they inherit
from WiFiCellTestBase and don't override cleanup(). But we override it.

BUG=none
TEST=`network_WiFi_Reset`; see AP torn down after

Change-Id: I3c23a4f11d5ebb41775513a9128720c140c08543
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1303613
Reviewed-by: Kirtika Ruchandani <kirtika@chromium.org>
diff --git a/server/site_tests/network_WiFi_Reset/network_WiFi_Reset.py b/server/site_tests/network_WiFi_Reset/network_WiFi_Reset.py
index 46ff4cc..f335781 100644
--- a/server/site_tests/network_WiFi_Reset/network_WiFi_Reset.py
+++ b/server/site_tests/network_WiFi_Reset/network_WiFi_Reset.py
@@ -162,3 +162,5 @@
         if hasattr(self, 'reset_driver') and self.reset_driver.need_reboot():
             logging.info("Test left DUT in bad state; rebooting")
             self.context.client.reboot(timeout=60)
+
+        super(network_WiFi_Reset, self).cleanup()