Merge "Update checkowners.py to support python3" am: 2f4e0217

Original change: https://android-review.googlesource.com/c/platform/build/+/2053986



Change-Id: I2ab99b872cdce1486a00ea805f644bf1e4282fa5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>