chromeos_config: stop email alerts on pre-cq-launcher, master-paladin

Also: delete some now-obsolete tests that depended on this config
values.

BUG=None
TEST=None

Change-Id: Id4e27c8956c39088165c7da5c38c7987fd136d00
Reviewed-on: https://chromium-review.googlesource.com/693145
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Paul Hobbs <phobbs@google.com>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
3 files changed