Merage homescreen-2017 modification to homescreen.

Merage homescreen-2017 modification to homescreen.

    1. Add "Remove useless ref to pulseaudio" commit to homescreen.
    2. Remove launch app code for my mistake merging.
    Right now this source is same as a8b94699ae7ec155729fcccda2be4f22328ca790.

Relative Commit:
https://gerrit.automotivelinux.org/gerrit/#/c/15563/

Change-Id: I966e86c73d9f66ac7a7ff6763be3544ecaba28cd
Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>
Signed-off-by: Stephane Desneux <stephane.desneux@iot.bzh>
Signed-off-by: zheng_wenlong <wenlong_zheng@nexty-ele.com>