webos-image: librolegen=21

:Release Notes:
Change ls-control command
 - Old : scan-services
 - New : scan-volatile-dirs

scan-services: scan all role/service files including built-in app/service
scan-volatile-dirs: scan installed app only in R/W partition.

:Detailed Notes:
submissions/20..submissions/21
2816d9b Change ls-control command

:Testing Performed:
See CCC jira link

:QA Notes:

:Issues Addressed:
[BHV-6693] ...
[BHV-11375] CCC: librolegen=21

Open-webOS-DCO-1.0-Signed-off-by: Sangwoo Kang <sangwoo82.kang@lge.com>

Change-Id: Ie7e649aa0765d65af6187e34f2a74780b88bb700
Originally-reviewed-on: https://g2g.palm.com/6188
Reviewed-on: https://g2g.palm.com/6439
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>