Devserver: make touch provision_failed as the first action in provision

This CL make 'touch /var/tmp/provision_failed' as the first action in CrOS
Auto-Update flow.

BUG=chromium:653368
TEST=Run repair in local autotest.

Change-Id: I29a47ac4735ad559f1fff5133d1efabe9aa5e435
Reviewed-on: https://chromium-review.googlesource.com/394888
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
1 file changed