Tests from PCU_Tests_RAW_SNS inherit most infrastructure from NS tests
defined in PCU_Tests_RAW, which in turn don't share that much with other
tests present in that file. This way we simplify file PCU_Tests_RAW.ttcn,
which will potentially grow once more tests are added.
Change-Id: If680d1bd7dbfe98829f330c33705e0f13bedf3c7
