Fix broken shard tests

:Release Notes:
Fixed: ShardsTest.nonexistingShard, ShardsTest.initalInactivity.

:Detailed Notes:

:Testing Performed:
tested on local build

:QA Notes:
run
root@m14tv:/usr/lib/db8/tests# ./gtest_db_core

:Issues Addressed:
[BHV-1215] Change ShardTest check value (invert them)

Open-webOS-DCO-1.0-Signed-off-by: Igor Kuksyuk <igor.kuksiuk@lge.com>

Change-Id: I49a8b10d68eef66bd47ca7966c1bae7a6e75840c
Reviewed-on: https://g2g.palm.com/4832
Reviewed-by: DCO Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>