Disable tko job export in the lab except for moblab.

BUG=chromium:748767
TEST=Manual test

Change-Id: I1ec0102b346e741ccd97bb1a04981c4e854932b4
Reviewed-on: https://chromium-review.googlesource.com/600845
Commit-Ready: Michael Tang <ntang@chromium.org>
Tested-by: Michael Tang <ntang@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Michael Tang <ntang@chromium.org>
diff --git a/global_config.ini b/global_config.ini
index a8a1b3e..8e715f3 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -68,6 +68,9 @@
 measure_run_time_tests: desktopui_ScreenLocker,login_LoginSuccess,security_ProfilePermissions
 # Incrementally update TKO with the status as the test runs.
 incremental_tko_parsing: False
+
+# Don't export tko job information to disk file.
+export_tko_job_to_file: False
 # If True, autoserv won't interact with real devices.
 # It will sleep 10 seconds and then pass successfully.
 testing_mode: False