Fix compatibility with 2.6 version of pbnjson

:Release Notes:
resolve external references in DomParser

:Detailed Notes:
add reference resolving to support the old interface

:Testing Performed:
unit tests, build

:QA Notes:

:Issues Addressed:
[BHV-1564] Resolve referred schemas right after parsing

Open-webOS-DCO-1.0-Signed-off-by: Andrii Zora <andrii.zora@lge.com>

Change-Id: Ia7b585c63bd271fcc8b0b2324eca2d78fdd84c86
Reviewed-on: https://g2g.palm.com/5664
Reviewed-by: DCO Verification
Reviewed-by: Andrii Zora <andrii.zora@lge.com>
Tested-by: Andrii Zora <andrii.zora@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>