Remove compilation warnings from libprivilege-control tests

Remove compilation warnings from libprivilege-control tests

[Issue#]        SSDWSSP-482
[Bug]           Libprivilege-control tests displayed warnings during compilation.
[Cause]         N/A
[Solution]      Replace deprecated functions with their replacements, supress warnings for functions
                that have no replacements, remove other warnings.
[Verification]  Build package - no warnings should appear. Run libprivilege-control-tests, all tests
                should pass just as they did earlier.

Change-Id: I41e2f69ad7fb1ff38b04eb7bcdfefcb7248fc0a9