Revert^2 "Convert per-test run scripts to python."

This reverts commit 8d6a4e021e1dc4717939e05aee89c9b18e383d12.

Reason for revert: Reland

Test: test.py -r --all-target
Test: diff emitted test commands before and after
Change-Id: I8b99d9b3804615f2ebc50171a4368ad87d809300
312 files changed