Compatibility with different session backend + admin layout

cas_server/management/commands/cas_clean_sessions.py

@@ -0,0 +1,11 @@
+from django.core.management.base import BaseCommand, CommandError
+from django.utils.translation import ugettext_lazy as _
+
+from ... import models
+
+class Command(BaseCommand):
+    args = ''
+    help = _(u"Clean deleted sessions")
+
+    def handle(self, *args, **options):
+        models.User.clean_deleted_sessions()