122427 rneamtu: Merged 5.0.N (5.0.4) to 5.1.N (5.1.1) (PARTIAL MERGE)
122412 nsmintanca: MNT-15642 CLONE - Request to join a moderated site multiple times
-added validation on backend to prevent multiple requests for joining a site
-updated unit tests
-added widget to display "Cancel request" button
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@123659 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261