Add WEBOS_LS2_SECURE variable to control security

:Release Notes:
Add option to control security in configuration files

:Detailed Notes:

:Testing Performed:
Luna-service2 was built several times to ensure that WEBOS_LS2_SECURE affects a security option in configuration files

:QA Notes:

:Issues Addressed:
[GF-39397] LS2: Make the security setting a DISTRO feature

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

Change-Id: I227ea34767a75a6b8e24f158f344408f36b5924a
Reviewed-on: https://g2g.palm.com/3559
Reviewed-by: Build 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>