[1.7.x] Fixed #23294 -- Add related_name to existing migrations.

Thanks to Florian Apolloner for the review; refs #23288.

Backport of 1d79d08 from master

django/contrib/auth/migrations/0001_initial.py

@@ -54,8 +54,8 @@ class Migration(migrations.Migration):
                 ('is_staff', models.BooleanField(default=False, help_text='Designates whether the user can log into this admin site.', verbose_name='staff status')),
                 ('is_active', models.BooleanField(default=True, help_text='Designates whether this user should be treated as active. Unselect this instead of deleting accounts.', verbose_name='active')),
                 ('date_joined', models.DateTimeField(default=timezone.now, verbose_name='date joined')),
-                ('groups', models.ManyToManyField(to='auth.Group', verbose_name='groups', blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of his/her group.')),
-                ('user_permissions', models.ManyToManyField(to='auth.Permission', verbose_name='user permissions', blank=True, help_text='Specific permissions for this user.')),
+                ('groups', models.ManyToManyField(to='auth.Group', verbose_name='groups', blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of his/her group.', related_name='user_set', related_query_name='user')),
+                ('user_permissions', models.ManyToManyField(to='auth.Permission', verbose_name='user permissions', blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user')),
             ],
             options={
                 'swappable': 'AUTH_USER_MODEL',