OTRS cache modules benchmark tool

https://dev.ib.pl/ib/otrs-ib/issues/8

Please merge to master if you find it useful (we don't use master for devel now and will try to be more compatible in the future).

On our portal we've published also mods, for which we don't have full copyright so we can't pull it here according to OTRS CLA:
* Sphinx full text searching in OTRS toolbar: https://dev.ib.pl/ib/otrs-ib/issues/4
* Memcached cache module for OTRS: https://dev.ib.pl/ib/otrs-ib/issues/6
* Redis cache module for OTRS: https://dev.ib.pl/ib/otrs-ib/issues/7

Regards,
Pawel