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

Thanks to Tim Graham for the review.

tests/admin_views/tests.py

@@ -23,7 +23,6 @@ from django.contrib.staticfiles.storage import staticfiles_storage
 from django.core import mail
 from django.core.checks import Error
 from django.core.files import temp as tempfile
-from django.core.urlresolvers import NoReverseMatch, resolve, reverse
 from django.forms.utils import ErrorList
 from django.template.loader import render_to_string
 from django.template.response import TemplateResponse
@@ -32,6 +31,7 @@ from django.test import (
     override_settings, skipUnlessDBFeature,
 )
 from django.test.utils import override_script_prefix, patch_logger
+from django.urls import NoReverseMatch, resolve, reverse
 from django.utils import formats, six, translation
 from django.utils._os import upath
 from django.utils.cache import get_max_age