Let's move to python3, it's 2020 and the conversion seemed
actually rather trivial (famous last words).
Change-Id: Ib1604b36c32630e1360e06567cbd5f63a78df547
The script contains python2-only syntax, so it can only be run with
python2. Make sure to explicitly specify it needs to be run with python2
in order to run it fine on distros where python points to python3.
Change-Id: Ie695c26f1b2a4f84bdc2b67938fe37a4c50681dd