[JUNIT] Rename AllTestSuites

The Eclipse IDE is unable to handle two classes with the same name
(AllTestSuite) in the same package (de.fu_berlin.inf.dpp) even if they
are in different projects (Saros/Eclipse, Saros/Core).

Change-Id: I9eab99fd1994031351c72ac0cdd5ebd6c7441a53
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1499
Tested-by: Jenkins CI
Reviewed-by: Damla Durmaz <ddurmaz88@gmail.com>
Reviewed-by: Andrej Szaffranietz <a.szaffranietz@gmail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>