Update the stumpy AP build to the latest

This version should add back the ath3k drivers.

BUG=chromium:446594
DEPLOY=test_importer
TEST=Manual; ran it and verified:
  Updated chromeos4-row12-rack7-host2 using the test
  Run hciconfig
  Verified there was output

Change-Id: I9bf885a04d3631f6c21ab875966799f605713158
Reviewed-on: https://chromium-review.googlesource.com/238895
Tested-by: Kris Rambish <krisr@chromium.org>
Reviewed-by: Bindu Mahadev <bmahadev@chromium.org>
Reviewed-by: Tien Chang <tienchang@chromium.org>
Commit-Queue: Kris Rambish <krisr@chromium.org>
diff --git a/server/site_tests/network_WiFi_UpdateRouter/network_WiFi_UpdateRouter.py b/server/site_tests/network_WiFi_UpdateRouter/network_WiFi_UpdateRouter.py
index 6ece345..d796b0d 100644
--- a/server/site_tests/network_WiFi_UpdateRouter/network_WiFi_UpdateRouter.py
+++ b/server/site_tests/network_WiFi_UpdateRouter/network_WiFi_UpdateRouter.py
@@ -35,8 +35,8 @@
     version = 1
 
     STABLE_VERSIONS = {
-            'stumpy': StableVersion('trybot-stumpy-test-ap/R40-6398.0.0-b14',
-                                    '6398.0.2014_10_23_1452'),
+            'stumpy': StableVersion('trybot-stumpy-test-ap/R41-6588.0.0-b16',
+                                    '6588.0.2014_12_16_1456'),
             'panther': StableVersion('trybot-panther-test-ap/R40-6443.0.0-b15',
                                      '6443.0.2014_11_05_1827'),
     }