prepare-submission.sh: Add addressed issues in message (v1.0.3)

:Release Notes:
Prepare list of Jira issues referenced in component repository between
submissions.

:Detailed Notes:

:Testing Performed:
Only build tested.

:QA Notes:
No change to image.

:Issues Addressed:
[ES-925] prepare-submission.sh: Output for :Detailed Notes: shows merge
         commits

Open-webOS-DCO-1.0-Signed-off-by: Eric Blade <eric.blade@lge.com>
Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: Id7f8ef6edf4bcf0d59826a3ca123096eb09b6115
Originally-reviewed-on: https://gpro.palm.com/58814
Reviewed-on: https://g2g.palm.com/6425
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>