[CLEANUP] #5198 Make setUp and tearDown protected

Change-Id: Iff5f32efe01415d5de4ac60aef5a8c5dd7d07acb
Reviewed-on: http://review.typo3.org/35453
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>