[SYNCOPE-551] Listing the first 1000 (say a high number) roles in the role tree

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_2_X@1627038 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-551] Merge from 1_2_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1627039 13f79535-47bb-0310-9956-ffa450edef68