[1.8.x] Removed explicit pointers to migration modules for contrib apps in runtest

        # us skip creating migrations for the test models.

        'auth': 'django.contrib.auth.tests.migrations',

        'contenttypes': 'django.contrib.contenttypes.tests.migrations',

        'flatpages_tests': 'django.contrib.flatpages.migrations',

        'redirects_tests': 'django.contrib.redirects.migrations',

    }

    if verbosity > 0: