[BUGFIX] Add exit code support to extbase commands

If an exit code is defined in CliResponse an exception is
thrown which contains the exit code as exception code.
The exception will be catched in CliRequestHandler::handleRequest
and the exception code will then be used as exit code.

Change-Id: I0c45e55531409d69c6cc6fe4888f97b5f117cef4
Resolves: #58781
Releases: master
Reviewed-on: http://review.typo3.org/42291


Reviewed-by: Stefan Froemken <froemken@gmail.com>
Tested-by: Stefan Froemken <froemken@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>