useless stringbuilder

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1469810 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-362] Added new REST method for enquerying supported ConnId object classes + used such method from admin console to enable / disable related schema mapping

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1469812 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-362] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1469814 13f79535-47bb-0310-9956-ffa450edef68