Change sleepd starting condition

:Release Notes:
Change sleepd starting condition

:Detailed Notes:
In order to support power-off in boottime.
sleepd should start ASAP.

Here is boot positions
- core-boot-done : very important services for factory line
- datastore-init-start : DB8 and SettingsServices and filecache
- init-boot-done : The services which needed for last-input-app
- minimal-boot-done : The services which needed for app launching
- rest-boot-done : Other services which can be deferred
- boot-done : Boot complete

:Testing Performed:
- #467 + This commit
- sleepd works fine in auto boot mode

:QA Notes:

:Issues Addressed:
[GF-55278] workload distribution to improve input responsiveness during boot

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

Change-Id: I4d0e6cde83dcc02b629ca5056a93ed88afd0f0f3
Reviewed-on: https://g2g.palm.com/4284
Reviewed-by: DCO Verification
Reviewed-by: Sangwoo Kang <sangwoo82.kang@lge.com>
Tested-by: Sangwoo Kang <sangwoo82.kang@lge.com>
Reviewed-by: Sapna Todwal <sapna.todwal@lge.com>
Tested-by: Sapna Todwal <sapna.todwal@lge.com>