Fix positional arguments for commands on modern Django.

Review Request #10546 — Created April 30, 2019 and submitted — Latest diff uploaded

Django Evolution

This updates the evolve, list-evolutions, and wipe-evolution
commands to properly take positional arguments on modern versions of
Django. Previously, these were limited to keyword arguments, due to a
change in how argument parsing works now in Django. Positional arguments
have to be explicitly added to the arg parser, with a name of args.

The base compatibility class has also been updated to not break when
positional arguments are used on versions of Django using optparse.

Ran these commands on Django 1.6 and 1.11 with positional arguments.