Add error reporting during JSON Schema parsing

:Release Notes:
Added proper calls of errorHandler's during jschema_parse*()

:Detailed Notes:

:Testing Performed:
Unit tests with valgrind. Added test to cover error reporting during schema
parsing

:QA Notes:

:Issues Addressed:
[GF-43955] pbnjson: Provide information about validation error

Open-webOS-DCO-1.0-Signed-off-by: Mykola Kryvonos <mykola.kryvonos@lge.com>

Change-Id: I61b370c5275efc312315d9c86bf0fe231f377f6d
Reviewed-on: https://g2g.palm.com/3818
Reviewed-by: Build Verification
Reviewed-by: Mykola Kryvonos <mykola.kryvonos@lge.com>
Tested-by: Mykola Kryvonos <mykola.kryvonos@lge.com>
Reviewed-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Tested-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>