Remove tests that use deprecated libprivilege-control API.

Remove tests that use deprecated libprivilege-control API.

[Feature]      Adapt tests to tizen.org
[Cause]        Libprivilege contained a lot of API that was marked deprecated
               for a long time. This API is removed in the following commit:
                   https://review.tizen.org/gerrit/#/c/19194/
[Solution]     Remove tests, macros, variables associated with old API:
               - app_register_av
               - app_add_friend
[Verification] Build, install and run tests on smack and non-smack environment.
               Ensure that libprivilege-control rpm built from the commit linked
               above is installed on the target.
               Removed tests should not be present.

Change-Id: I59ef71c5684a29a4fb6ba6a8f6a4a667e3f99ab0
Signed-off-by: Marcin Lis <m.lis@samsung.com>