Update remaining python scripts in repo to python3 shebang

dev/create-release/releaseutils.py:#!/usr/bin/env python
dev/create-release/generate-contributors.py:#!/usr/bin/env python
dev/create-release/translate-contributors.py:#!/usr/bin/env python
dev/github_jira_sync.py:#!/usr/bin/env python
dev/merge_spark_pr.py:#!/usr/bin/env python
python/pyspark/version.py:#!/usr/bin/env python
python/pyspark/find_spark_home.py:#!/usr/bin/env python
python/setup.py:#!/usr/bin/env python