Fixed #26013 -- Moved django.core.urlresolvers to django.urls.

Thanks to Tim Graham for the review.

tests/generic_inline_admin/tests.py

@@ -9,12 +9,12 @@ from django.contrib.auth.models import User
 from django.contrib.contenttypes.admin import GenericTabularInline
 from django.contrib.contenttypes.forms import generic_inlineformset_factory
 from django.contrib.contenttypes.models import ContentType
-from django.core.urlresolvers import reverse
 from django.forms.formsets import DEFAULT_MAX_NUM
 from django.forms.models import ModelForm
 from django.test import (
     RequestFactory, SimpleTestCase, TestCase, override_settings,
 )
+from django.urls import reverse
 
 from .admin import MediaInline, MediaPermanentInline, site as admin_site
 from .models import Category, Episode, EpisodePermanent, Media, PhoneNumber