Deny access to resources if the resource's ACL don't allow the organizer
to read its freebusy info.
Without this, sogo would always auto-accept invitations from 'unprivileged'
users, potentially bypassing the multiplebooking parameter.
Monotone-Parent: 8ac367dca61f0a4a66df59c7c786dd0f5016050d
Monotone-Revision: 1f2bd4b4727f3158ab77ca76322cd555967d326a
Monotone-Author: jraby@inverse.ca
Monotone-Date: 2012-05-15T14:36:52