Removed admin_util test dependency on contrib.sites

from django.utils.encoding import python_2_unicode_compatible

@python_2_unicode_compatible

class Site(models.Model):

    domain = models.CharField(max_length=100)

    def __str__(self):

        return self.domain

class Article(models.Model):

    """

    A simple Article model for testing

    """

    site = models.ForeignKey('sites.Site', related_name="admin_articles")

    site = models.ForeignKey(Site, related_name="admin_articles")

    title = models.CharField(max_length=100)

    title2 = models.CharField(max_length=100, verbose_name="another name")

    created = models.DateTimeField()

from django.contrib.admin.utils import (display_for_field, flatten,

    flatten_fieldsets, label_for_field, lookup_field, NestedObjects)

from django.contrib.admin.views.main import EMPTY_CHANGELIST_VALUE

from django.contrib.sites.models import Site

from django.db import models, DEFAULT_DB_ALIAS

from django import forms

from django.test import TestCase

from django.utils.safestring import mark_safe

from django.utils import six

from .models import Article, Count, Event, Location, EventGuide, Vehicle, Car

from .models import Site, Article, Count, Event, Location, EventGuide, Vehicle, Car

class NestedObjectsTests(TestCase):