[moblab] Update moblab configuration settings

Move the to the lastest stable version
Update notifications from staging to production

BUG=chromium:711820
TEST=None

Change-Id: Id59fb8f13f4922025ed33a2831ab0bbbb2b6ec7f
Reviewed-on: https://chromium-review.googlesource.com/478475
Commit-Ready: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Jinsong Mu <jinsong@google.com>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/490521
Reviewed-by: Michael Tang <ntang@chromium.org>
Commit-Queue: Keith Haddow <haddowk@chromium.org>
diff --git a/moblab_config.ini b/moblab_config.ini
index e99e91c..6f3a4fd 100644
--- a/moblab_config.ini
+++ b/moblab_config.ini
@@ -27,7 +27,7 @@
 cts_results_server:
 # In moblab, this paramater is empty and uses the image bucket by default.
 results_storage_server:
-stable_cros_version: R55-8872.67.0
+stable_cros_version: R57-9202.66.0
 
 # The pubsub topic the gs_offloader notification is sent to.
 cloud_notification_topic: projects/chromeos-partner-moblab/topics/moblab-notification