Split Chameleon suite into two, with different connections

We want to run the same suite on both HDMI and DP connections.
DUTs connected with Chameleon via DP are labeled 'chameleon:dp'.
DUTs connected with Chameleon via HDMI are labeled 'chameleon:hdmi'.

This change splits the original single test suites into two. For
example, the 'chameleon_hdmi' suite only runs tests on DUTs with
a 'chameleon:hdmi' label.

BUG=chromium:394436
TEST=site_utils/suite_scheduler/suite_scheduler.py --sanity

Change-Id: Ic6b7eeaaa307998bc4ad2cfb6ca04d0a2a540755
Reviewed-on: https://chromium-review.googlesource.com/211991
Tested-by: Wai-Hong Tam <waihong@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
15 files changed