run-test: Convert from bash to python. am: d5f69e241e

Original change: https://android-review.googlesource.com/c/platform/art/+/2239595

Change-Id: I36c7e6e8929ca644519d026b46123f68871652d2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>