[CLEANUP] #5198 Make setUp and tearDown protected

Change-Id: I6adfe01e350773bce6031e2800ac49ea3be22ddd
Reviewed-on: http://review.typo3.org/35452
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>