Implemented MojDbShardEngine::update, getId

:Release Notes:
implemented MojDbShardEngine::update() and MojDbShardEngine::getId()

:Detailed Notes:

:Testing Performed:
tested on build

:QA Notes:

:Issues Addressed:
[GF-33840] ShardEngine doesn't lookup in database for existing shard

Open-webOS-DCO-1.0-Signed-off-by: Igor Kuksyuk <ikuksyuk@luxoft.com>

Change-Id: Ie261a25aa580994f327197c4ffd6c40b6e154ba5
Reviewed-on: https://g2g.palm.com/3219
Reviewed-by: Build Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>