Move ls-performance to C++ folder

:Release Notes:
Move ls-performance to C++ folder

:Detailed Notes:

:Testing Performed:
Unit tests

:QA Notes:

:Issues Addressed:
[BHV-4624] Implement a performance benchmark tool for luna-service2

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

Change-Id: I686a67934636ddf3d1e0c78ed3c82a013b8e59c8
Reviewed-on: https://g2g.palm.com/5588
Reviewed-by: DCO Verification
Reviewed-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Tested-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Reviewed-by: Sergiy Kryvonos <sergiy.kryvonos@lge.com>
Reviewed-by: Oleksii Rudenko <oleksii.rudenko@lge.com>
Reviewed-by: Andrii Zora <andrii.zora@lge.com>