Fix remaining imports deprecated in Wagtail 3.0

docs/reference/pages/model_recipes.md

@@ -258,7 +258,7 @@ To add the tag interface, add the following block of code to a `wagtail_hooks.py
 
 ```python
 from wagtail.contrib.modeladmin.options import ModelAdmin, modeladmin_register
-from wagtail.admin.edit_handlers import FieldPanel
+from wagtail.admin.panels import FieldPanel
 from taggit.models import Tag
 
 

wagtail/admin/tests/pages/test_reorder_page.py

@@ -1,9 +1,9 @@
 from django.test import TestCase
 from django.urls import reverse
 
-from wagtail.core.models import Page
+from wagtail.models import Page
 from wagtail.test.testapp.models import BusinessChild, BusinessIndex, SimplePage
-from wagtail.tests.utils import WagtailTestUtils
+from wagtail.test.utils import WagtailTestUtils
 
 
 class TestPageReorder(TestCase, WagtailTestUtils):

wagtail/admin/tests/test_upgrade_notification.py

@@ -1,7 +1,7 @@
 from django.test import RequestFactory, TestCase, override_settings
 
 from wagtail.admin.views.home import UpgradeNotificationPanel
-from wagtail.tests.utils import WagtailTestUtils
+from wagtail.test.utils import WagtailTestUtils
 
 
 class TestUpgradeNotificationPanel(TestCase, WagtailTestUtils):

wagtail/admin/tests/test_whats_new.py

@@ -2,7 +2,7 @@ from django.test import RequestFactory, TestCase, override_settings
 from django.urls import reverse
 
 from wagtail.admin.views.home import WhatsNewInWagtailVersionPanel
-from wagtail.tests.utils import WagtailTestUtils
+from wagtail.test.utils import WagtailTestUtils
 from wagtail.users.models import UserProfile