flake8 fixes (unused imports and variables).

from django.contrib.auth.tests.custom_user import CustomUser

from django.contrib.auth.tests.utils import skipIfCustomUser

from django.core.exceptions import ImproperlyConfigured

from django.core.management import call_command

from django.dispatch import receiver

from django.test import TestCase, override_settings

from django.test.signals import setting_changed

        available on self.stdin.

        If no such option is passed, it defaults to sys.stdin.

        """

        user_data = {'username': 'foo', 'email': 'foo@example.com'}

        sentinel = object()

        command = createsuperuser.Command()

        command.execute(

from django.core import management

from django.core.management import CommandError

from django.core.management.base import BaseCommand

from django.core.management.utils import popen_wrapper

from django.test import SimpleTestCase

from django.utils import translation