SAK-23257 Use restrictedRoles instead of allowedRoles patch from Brian at Western U. Sam changes to reduce code duplication and put the code into SiteParticipantHelper. 


git-svn-id: https://source.sakaiproject.org/svn/site-manage/trunk@130275 66ffb92e-73f9-0310-93c1-f5514f145a0a