Minor since so few people use them, but it would probably be good to have a requirements file for our python release tools for easier setup (also version pinning).

cc JoshRosen who looked at the original JIRA.

Author: Holden Karau <holden@us.ibm.com>

Closes #10871 from holdenk/SPARK-10498-add-requirements-file-for-dev-python-tools.