Add keyword arguments

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/tests/mixins.py

@@ -12,7 +12,6 @@ from django.apps import apps
 from django.conf import settings
 from django.conf.urls import url
 from django.contrib.contenttypes.models import ContentType
-from django.core import management
 from django.db import connection, models
 from django.db.models.signals import post_save, pre_save
 from django.http import HttpResponse