[Autotest] Enable security weekly for older branches.

TEST=pylint
BUG=None

Change-Id: Icacf2240e2d87ba9b4337d9e147cbada2b2f139f
Reviewed-on: https://chromium-review.googlesource.com/219633
Reviewed-by: Prashanth B <beeps@chromium.org>
Commit-Queue: Prashanth B <beeps@chromium.org>
Tested-by: Prashanth B <beeps@chromium.org>
1 file changed