Update all scripts to use python3 instead of python.
Review Request #11834 — Created Oct. 2, 2021 and submitted — Latest diff uploaded
This updates all scripts in the Djblets tree to use
python, ensuring that the right version is used when in an environment
containing both versions.
run-pyflakes.pyneeded some changes to run on Python 3. While we may
want to remove this script, that's a decision that'll be left for after
Tested all scripts and made sure they ran.