Add new functions to security-server API.

Add new functions to security-server API.

[Issue#]        SSDWSSP-45
[Cause]         Implement new APIs for getting SMACK label
                of peer in security-server
[Problem]       Two new function needed in API. Both returns
                SMACK labels but ttaking another parameters.
                First uses cookie, second socked descriptor.
[Solution]      New functions added
[Verification]  Tests should not fail

Change-Id: I4ca044230f1cba1174b61abae6b7641e1bbfcdbc