[SYNCOPE-369] Adapting login form to 1.1.X SyncopeClientErrorHanlder

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1480575 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-369] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1480576 13f79535-47bb-0310-9956-ffa450edef68