webos-pro-image: Update layer pins for 2013-10-29

meta-webos as of 2013-10-29 13:49:52 -0700

20b6fa5 webos-image: luna-service2=158
63e15f3 webos-image: upstart=r5 (don't install unnecessary files)
b8259f8 webos-image: libpbnjson=23

Open-webOS-DCO-1.0-Signed-off-by: Susan Montooth <susan.montooth@lge.com>

Change-Id: I288220db375bc9c9876ea31d4cb419bf70029193
Reviewed-on: https://g2g.palm.com/3740
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>