Changing tests to run properly on RUNNER_MULTIPROCESS_TEST macro.

Changing tests to run properly on RUNNER_MULTIPROCESS_TEST macro.

[Issue#]        SSDWSSP-438
[Bug/Feature]   While failing, test case exits with several processes. Tests
                are duplicated.
[Cause]         No multiprocessing assert handling.
[Solution]      Adding new test case types to wrt-commons:
                http://slp-info.sec.samsung.net/gerrit/#/c/267716/
[Verification]  Building wrt-commons and running tests. If failing, shold exit
                properly (one process at the end of the test case).

Change-Id: Ib373141bdf577c00cf1c66fe54ad97e0d3e2701c