New API for permission checking

New API for permission checking

[Issue#]       SSDWSSP-527
[Feature]      Introduce new API function.
[Cause]        New API will improve the performance while checking
               app permissions. It is also needed by Security Server.
[Solution]     One new API function is added, which enables user to check
               whether an app with given label has enabled permission
               specified by name.
[Verification] Build, install & run tests.

Change-Id: I4c068f593c585d5a16e2ca9f72666aea79fafcab