Add second index for device path

:Release Notes:
Add missing index for path/shard to complement the existing
shard/path index, to fix a problem with MojDbShardManagerTest.
Add kind registration.

:Detailed Notes:

:Testing Performed:
build #276

:QA Notes:

:Issues Addressed:

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

Change-Id: I3c6828898fb9099e920842128d3df7078aa8dbbb
Reviewed-on: https://g2g.palm.com/3138
Reviewed-by: Build Verification
Reviewed-by: Roger Stringer <roger.stringer@lge.com>
Tested-by: Roger Stringer <roger.stringer@lge.com>