Implement test for adding new WRT rules in libprivilege-control

Implement test for adding new WRT rules in libprivilege-control

[Issue#]       SSDWSSP-599
[Feature]      New test for perm_app_setup_path with
               new option PERM_APP_PATH_RUNTIME.
[Cause]        New functionality.
[Solution]     New test case nr 20 in libprivilege tests.
               Currently ignored tc 20 switched to tc 21.
[Verification] Build, install, run:
               # libprivilege-control-test --output=text
               Verify that tc20 npruntime is passing and no
               other test cases are affected.

               Synchronize libprivilege with the following commit:
               http://slp-info.sec.samsung.net/gerrit/#/c/314185/

Change-Id: I468a6091997d608ff2b10ebd893b88fca8bf641f