cheets_CTS/GTS: Tentatively allow max 30 retries on the beta channel.

We want to estimate the flakiness ratio of several boards
before it goes to stable (which already allows 30).

BUG=b:133433007
TEST=cheets_CTS_P.9.0_r8.arm.CtsSensorTestCases

Change-Id: I38f0b7c326a9726a7258e0e282966ac4360ee61e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1686927
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Tested-by: Kazuhiro Inaba <kinaba@chromium.org>
Auto-Submit: Kazuhiro Inaba <kinaba@chromium.org>
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
diff --git a/server/cros/tradefed_test.py b/server/cros/tradefed_test.py
index 90ed554..6cf2a59 100644
--- a/server/cros/tradefed_test.py
+++ b/server/cros/tradefed_test.py
@@ -53,7 +53,7 @@
     # parameter in control files can override the count, within the
     # _BRANCH_MAX_RETRY limit below.
     _BRANCH_DEFAULT_RETRY = [(0, 5), (1, 10)]  # dev=5, beta=stable=10
-    _BRANCH_MAX_RETRY = [(0, 5), (1, 10),      # dev=5, beta=10, stable=99
+    _BRANCH_MAX_RETRY = [(0, 5), (1, 30),      # dev=5, beta=30, stable=99
         (constants.APPROXIMATE_STABLE_BRANCH_NUMBER, 99)]
     # TODO(kinaba): betty-arcnext
     _BOARD_MAX_RETRY = {'betty': 0}