Pass yajl`s error description to callback

:Release Notes:
Pass error description from yajl parser into error callabck

:Detailed Notes:

:Testing Performed:
New unit test was written. All unit tests were passed successfully.
Tests were run with memory errors detection.

:QA Notes:

:Issues Addressed:
[GF-8625] Refine error messages when parsing JSON

Open-webOS-DCO-1.0-Signed-off-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>