[SYNCOPE-499] Added careful checks before using role template's parent, user owner and role owner

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1600646 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-499] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1600652 13f79535-47bb-0310-9956-ffa450edef68