[SYNCOPE-356] Fixed incorrect IModel for resources' AjaxPalettePanel (roles)

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1467915 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-356] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1467917 13f79535-47bb-0310-9956-ffa450edef68