[testcases] Creation of Ubuntu Studio specific testcase

[Ralf Mardorf]

IMO it's also important to check whether rtirq fits to the kernel
version. To run jack MIDI latency test. Take care about a working,
complete Jack.
Rtirq very often is outdated, working for the default config, but unable
to handle soft IRQs, while hardware does share IRQs.
It's not an issue for me, I replace bad packages by self-build packages,
but it's not good, if the installed Ubuntu Studio ships with such
issues, because a lot of users won't compile basic software.

OT: Perhaps others followed Len's thread at LAU too. I accept that some
people like to use session managers, OTOH Jack compiled for dbus usage
is a PITA for many users. While for me it's only annoying, but I'm able
to handle it, for blind users it could become a serious issue. Since
Jack anyway is split into several grotesque packages, it might be a good
idea to have useful packages for Jack with and without dbus. Blind users
might install Ubuntu Studio and then remove X. Of course, the blind
users on LAU use other distros, but it couldn't harm to think about some
new issues.

Regards,
Ralf