chromeos_config: release_cts_gts: Use hw_tests

1) Use hw_tests instead of hw_tests_override to launch cts/gts qualification
suite in the release builder.
2) Use async hw_test instead of sync test

BUG=b:62821305
TEST=chromeos_config_unittest --update
TEST=pylint

Change-Id: I5ffb221b64455f1f31b1afef27c4ac6b7ff8fd61
Reviewed-on: https://chromium-review.googlesource.com/563532
Commit-Ready: Ilja H. Friedel <ihf@chromium.org>
Tested-by: Ilja H. Friedel <ihf@chromium.org>
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
(cherry picked from commit 204b9b2e108349a1665129bccd68e3c26ce347df)
Reviewed-on: https://chromium-review.googlesource.com/592342
Commit-Queue: Po-Hsien Wang <pwang@chromium.org>
Tested-by: Po-Hsien Wang <pwang@chromium.org>
2 files changed