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We are seeing regular hangs on bots when running 'wpt manifest' on
Python 3, which is causing them to go red. Initial investigations have
not been able to locate a root cause (other than the upgrade), so to
stop the bleeding lets switch back to Python 2 for now.

This is not a long-term fix, just a bandaid. WPT is going to Python 3
only in ~Feb 2021, and will start introducing breaking code changes. If
we cannot resolve the issue here, we will end up stuck on old WPT
tooling forever (which is very much not desirable!).

Bug: 1161274
Change-Id: I7cef267d7b4f725a2069950852c75fa4fc009fb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623816
Auto-Submit: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Luke Z <lpz@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842620}