add support for django 1.11 replacing django.utils.importlib (#21489)

src/authentic2_idp_openid/utils.py

@@ -2,10 +2,10 @@
 # vim: set ts=4 sw=4 fdm=indent : */
 # some code from http://www.djangosnippets.org/snippets/310/ by simon
 # and from examples/djopenid from python-openid-2.2.4
+from importlib import import_module
 
 import openid.server
 from django.core.exceptions import ImproperlyConfigured
-from django.utils.importlib import import_module
 from django.http import HttpResponse, HttpResponseRedirect
 
 import conf