Moved querysets to separate files; tweaked interface ordering logic (#1523)

netbox/secrets/querysets.py

@@ -0,0 +1,13 @@
+from __future__ import unicode_literals
+
+from django.db.models import QuerySet
+
+
+class UserKeyQuerySet(QuerySet):
+
+    def active(self):
+        return self.filter(master_key_cipher__isnull=False)
+
+    def delete(self):
+        # Disable bulk deletion to avoid accidentally wiping out all copies of the master key.
+        raise Exception("Bulk deletion has been disabled.")