Fix binary files permissions

:Release Notes:
Permissions for all test binaries are set to owner rwx only.

:Detailed Notes:

:Testing Performed:
tested on local build

:QA Notes:
/usr/lib/db8/tests# ls -la

:Issues Addressed:
[ANG-67] db8-tests: fix binary files permissions

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

Change-Id: Ic6cebf28f9bbe03b3d3ecf5d164c447a63aedcca
Reviewed-on: https://g2g.palm.com/4440
Reviewed-by: DCO Verification
Reviewed-by: Oleksii Uratkin <oleksii.uratkin@lge.com>
Tested-by: Oleksii Uratkin <oleksii.uratkin@lge.com>