Comment 7 for bug 1438612

dbus would be stopped by the final killing spree.

This usually looks like this

<stop individual services in reverse order>

Sending SIGTERM to remaining processes...
Sending SIGKILL to remaining processes...
Unmounting file systems.
All filesystems unmounted.
Deactivating swaps.
All swaps deactivated.
Detaching loop devices.
All loop devices detached.
Detaching DM devices.
All DM devices detached.
system-shutd[ 51.216341] reboot: Power down
own succeeded.
Powering off.

I don't think, there is anything special that dbus needs to do on stop.