Possible improvement of bbappend for dbus

dbus_%.bbappend

This installs systemd files for D-Bus. One .service, one .socket, and a dbus configuration file. That looks like typical system-unique stuff (meaning that a unique append might make sense), but it could be discussed if those files are best served by a .bbappend or by a separate system component (.bb) but it is probably no big deal.

However, it is not clear to me if the do_install step is doing this correctly. It is not inheriting the systemd bbclass, which should be the normal way to activate a service. TODO: Investigate and if possibly modify to do it in the standard canonical way.