[SYNCOPE-431] Removing unnecessary debug statements from controllers' methods and enhancing ControllerHandler's debug statements

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_1_X@1544553 13f79535-47bb-0310-9956-ffa450edef68
[SYNCOPE-431] Merge from 1_1_X

git-svn-id: https://svn.apache.org/repos/asf/syncope/trunk@1544573 13f79535-47bb-0310-9956-ffa450edef68