Fixed a pyflakes issue.

 - Legacy-Id: 13235

Author: levkowetz

ietf/utils/management/commands/check_referential_integrity.py

@@ -5,7 +5,6 @@
 from django.apps import apps
 from django.core.management.base import BaseCommand #, CommandError
 from django.core.exceptions import FieldError
-from django.db import models
 from django.db.models.fields.related import ForeignKey, OneToOneField
 
 import debug                            # pyflakes:ignore