Use dispatching for logout.php

Resolves: #65291
Releases: master
Change-Id: Ic003ec6dda083f69da2aaf0373ad48ea3bf4f56f
Reviewed-on: http://review.typo3.org/37411


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>