Indicate service-bus.sh script is a bash script

Open-webOS-DCO-1.0-Signed-off-by Roger Stringer <roger.stringer@palm.com>

Change-Id: Iefbbb01b38e8c4daa3adf0f987b45382d6750564
Reviewed-on: http://g2g.palm.com/1355
Reviewed-by: Build Verification
Reviewed-by: Roger Stringer <roger.stringer@palm.com>
Tested-by: Roger Stringer <roger.stringer@palm.com>