setup.py packages test directory

[dfn-certling]

The current setup.py causes the test directory to be packaged as an additional top level Python package test besides netfields:

$ mkdir netfields
$ python3 -m venv netfields
$ source netfields/bin/activate
$ pip install django-netfields
$ ls netfields/lib/python3.8/site-packages/test
__init__.py  migrations  models.py  __pycache__  tests

Is this on purpose? If not, test should probably be excluded from being picked up by find_packages.