cbuildbot_config: disable cros flash/deploy VM tests

cros flash/deploy are developer tools and their tests should not
affect releases. Disable this for the release branch to see if the
archiving error could be resolved.

BUG=chromium:394992
TEST=`cbuildbot/run_tests`

Change-Id: Ib43f517d6062eddb6a4a22420e05248c7fec93eb
Reviewed-on: https://chromium-review.googlesource.com/209160
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
2 files changed