Create stress test for libprivilege-control API

Create stress test for libprivilege-control API

[Issue#]       SSDWSSP-405
[Feature]      New stress tests
[Cause]        This kind of test did not exist previously
[Solution]     Two test cases added:
               * Install and uninstall the same app 100 times, each time
                 app gets some privileges (to shared folders & from api features)
               * Install and uninstall set of 10 apps 10 times.
                 Installed applications have various kind of permissions
                 to each other from api-features and shared folders.
[Verification] Build and run all tests:
               * Previous tests should not be affected
               * New test case should pass.

Change-Id: I5003981456f502a89e334e320e89500fb4647a7f