Moved contrib.sites tests out of contrib.

from django.apps import apps

from django.conf import settings

from django.contrib.sites import models

from django.contrib.sites.management import create_default_site

from django.contrib.sites.middleware import CurrentSiteMiddleware

from django.contrib.sites.models import Site, clear_site_cache

from django.contrib.sites.requests import RequestSite

from django.contrib.sites.shortcuts import get_current_site

from django.core.exceptions import ObjectDoesNotExist, ValidationError

from django.db.models.signals import post_migrate

from django.http import HttpRequest

from django.test import TestCase, modify_settings, override_settings

from django.test.utils import captured_stdout

from . import models

from .management import create_default_site

from .middleware import CurrentSiteMiddleware

from .models import Site, clear_site_cache

from .requests import RequestSite

from .shortcuts import get_current_site

@modify_settings(INSTALLED_APPS={'append': 'django.contrib.sites'})

class SitesFrameworkTests(TestCase):