Merge "Convert generate-self-extracting-archive.py to python 3" am: 7ca77ea9...

Merge "Convert generate-self-extracting-archive.py to python 3" am: 7ca77ea9 am: ecf39825 am: 053bce1c am: bf0e5be1

Original change: https://android-review.googlesource.com/c/platform/build/+/1935067

Change-Id: I9e294ea8b3d5a59ef53076f7c053762f1796671b