v3: move stress_edid to v3/clients

`stress_edid.py` is supposed to do a video (therefore not covered by
the deprecated v2 anymore) stress test by swapping lots of EDIDs, We've
only tested it on v3 and it even has some v3isms in it.

Let's move it to our folder.

Also make it use the common read_edid() function from screenshot.py

BUG=b/278291165
TEST=v3/clients/stress_edid.py --port 0

Change-Id: Ife3c8d196ed50b3d622fd4ff0d3f8868c27246ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/chameleon/+/4525151
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Commit-Queue: Alexandru Stan <amstan@chromium.org>
Tested-by: Alexandru Stan <amstan@chromium.org>
2 files changed