dump1090: remove interactive options, hardcode quiet and add respawn config.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
shairplay: add respawn config.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
udpxy: rework init script and add disabled/respawn configs.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>