Fix some simple Python 3 issues with management commands.
Review Request #10322 — Created Nov. 14, 2018 and submitted
The management commands still don't have any real Python 3 support.
While this change doesn't guarantee any support, it does fix some
low-hanging fruit involving calls to
worked with Python 2. These have been updated to make use of
Ran the commands on Python 2 and verified that they're showing help
output and prompting for input.