Change ls-control command

:Release Notes:
Change ls-control command

:Detailed Notes:
librolegen calls ls2 to rescan all role files
when it creates a role file.
However, it takes too much time
because ls2 rescans all services' role files.

In order to reduce the time, we should use
more light version api.
'scan-volatile-dirs' is that one.

:Testing Performed:
We tested it with latest build image.
Native app launching time is improved about 0.5s

:QA Notes:

:Issues Addressed:
[BHV-6693] Netflix launch duration is longer than on the Initial Release

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

Change-Id: I93be9e9f3cf721604cc0bc5f40341701e180e814
Reviewed-on: https://g2g.palm.com/5955
Reviewed-by: DCO Verification
Reviewed-by: Sangwoo Kang <sangwoo82.kang@lge.com>
Tested-by: Sangwoo Kang <sangwoo82.kang@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Merge branch 'develop'