pulseaudio: add alsa configuration to system configuration file

Signed-off-by: Simon Busch <morphis@gravedo.de>
pulseaudio: add upstart script to start in system mode on startup

Signed-off-by: Simon Busch <morphis@gravedo.de>
packagegroup-webos-upstart: add pulseaudio-upstart package

Signed-off-by: Simon Busch <morphis@gravedo.de>