[STF] fixed test class naming

Blaming myself that I am to dumb to follow the rules I put onto the
webpage regarding naming conventions for test classes.

Change-Id: Ib3da0f7e33bda12ed434a6f24e1774b0006b7d23
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1053
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>