Automatically retry au test to protect against reboot concerns.

BUG=chromium:386341
TEST=Visual

Change-Id: Ie0c3325fa6f142a2c68b423e5c92d420a67505dd
Reviewed-on: https://chromium-review.googlesource.com/204730
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Tracy Turchetto <tturchetto@chromium.org>
(cherry picked from commit 31b2350f9049ea18b60f1f3d8eee09c879de13f7)
Reviewed-on: https://chromium-review.googlesource.com/205724
Reviewed-by: Chris Sosa <sosa@chromium.org>
diff --git a/server/site_tests/autoupdate_EndToEndTest/control b/server/site_tests/autoupdate_EndToEndTest/control
index 9f638f0..51cc4ab 100644
--- a/server/site_tests/autoupdate_EndToEndTest/control
+++ b/server/site_tests/autoupdate_EndToEndTest/control
@@ -13,6 +13,7 @@
 TEST_CATEGORY = "Functional"
 TEST_CLASS = "platform"
 TEST_TYPE = "server"
+JOB_RETRIES = 2
 
 DOC = """
 This is an end-to-end update test of Chrome OS releases. Given a test