Modify smartkey-hun start position in upstart 1.8

:Release Notes:
Modify smartkey-hun start position in upstart 1.8.

:Detailed Notes:
The smartkey-hun starts after luna-bus now.
However, that start position should be changed
beacause of snapshot boot.
Luna-bus should be in snapshot part in the future.
"mount-readwrite" is the position right after snapshot.

:QA Notes:
miniBAT is passed.

:Issues Addressed:
[GF-16469] [Boottime] change the start position of smartkey.conf
[GF-9985] snapshot boot: LS2: change the start condition
[GF-2635] [Boottime] Upgrade to Upstart 1.8

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

Change-Id: I5b08cc24ac12333137c39dff771072942ddfb199
Reviewed-on: https://g2g.palm.com/3141
Reviewed-by: Sangwoo Kang <sangwoo82.kang@lge.com>
Tested-by: Sangwoo Kang <sangwoo82.kang@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>