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Python 3 became the default in January, causing the scripts to error
unless explicitly run with Python 2 (which will be removed from test
images soon).

Bug: none
Test: run scripts with Python 2 then 3, and compare the output
Change-Id: I6d4aef94cb3de45f710875f04449f756d0592cec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414769
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807552}