Use pbnjson for reading role files

:Release Notes:
Security configuration files now are read using pbnjson json library
instead of cjson.

:Detailed Notes:
- Replaced cjson parsing library with pbnjson for reading role files
- Marked with static-linkage symbols that are local to security.c file
- Added SetLSErrorCallbacks function to forward error reporting from
  pbnjson to LSError container
- Added handling of WEBOS_USE_WERROR cmake option to treat warnings more
  strictly
- Adjusted dependencies to be in sync with actual code

:Testing Performed:
unit-tests on desktop build

:QA Notes:

:Issues Addressed:
[BHV-6] luna-service2: replace cjson use with pbnjson

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>

Change-Id: I51d2d91340083a3e9fbfc012c1eb102b75bd0113
Reviewed-on: https://g2g.palm.com/4869
Reviewed-by: DCO Verification
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Tested-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Tested-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>