Explicitly import permission set definitions in validator.py.

r2/r2/lib/validator/validator.py

@@ -34,6 +34,7 @@ from r2.lib.db.operators import asc, desc
 from r2.lib.template_helpers import add_sr
 from r2.lib.jsonresponse import JQueryResponse, JsonResponse
 from r2.lib.log import log_text
+from r2.lib.permissions import ModeratorPermissionSet
 from r2.models import *
 from r2.lib.authorize import Address, CreditCard
 from r2.lib.utils import constant_time_compare