Fixed #29559 -- Fixed TransactionTestCase.reset_sequences for auto-created m2m through models.

tests/test_runner/models.py

@@ -4,6 +4,7 @@ from django.db import models
 class Person(models.Model):
     first_name = models.CharField(max_length=20)
     last_name = models.CharField(max_length=20)
+    friends = models.ManyToManyField('self')
 
 
 # A set of models that use a non-abstract inherited 'through' model.