Disable build of unit tests by default. Commit 2

:Release Notes:

:Detailed Notes:

:Testing Performed:

:QA Notes:

:Issues Addressed:
[BHV-4671] Don't build unit tests of luna-service2 by default

Open-webOS-DCO-1.0-Signed-off-by: Alekseyev Oleksandr<alekseyev.oleksandr@lge.com>

Change-Id: I6ea046d11ff0096a36158c0d8da6bbf2bd84c653
Reviewed-on: https://g2g.palm.com/5363
Reviewed-by: DCO Verification
Reviewed-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Tested-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>