do schema validation for incoming calls

:Release Notes:
Optional schema validation for incoming calls according to category
description.

:Detailed Notes:
- implement LSCategoryValidateCall
- call validation if LUNA_METHOD_FLAG_VALIDATE_IN specified for method
- enable integration test TestCategory.Validation (test_category)

:Testing Performed:
unit/integration tests under desktop

:QA Notes:

:Issues Addressed:
[BHV-1592] Implement optional validation of received payload

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

Change-Id: I09fd3dfdc47271c200e4145f788f8498b3bf1ce0
Reviewed-on: https://g2g.palm.com/5510
Reviewed-by: DCO Verification
Reviewed-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Tested-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>