[TASK] Drop migration code in Install Tool

The code which migrates the old localconf.php file is dropped now.

Resolves: #68056
Releases: master
Change-Id: I29847f8d1fbbd8be80790e2b340c2429f0d03a4c
Reviewed-on: http://review.typo3.org/41102


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>