misc: inherit from a2.authenticators.BaseAuthenticator (#40876)

src/authentic2_auth_kerberos/authenticators.py

@@ -1,12 +1,12 @@
 from django.utils.translation import gettext_noop
 from django.shortcuts import render
 
-from authentic2 import constants, utils
+from authentic2 import utils, authenticators
 
 from . import app_settings
 
 
-class KerberosAuthenticator(object):
+class KerberosAuthenticator(authenticators.BaseAuthenticator):
     def enabled(self):
         return app_settings.ENABLE