[arch-announce] D-Bus now launches user buses

The packages `systemd` 226-1 plus `dbus` 1.10.0-3 now launch _dbus-daemon_ once
per user; all sessions of a user will share the same D-Bus "session" bus. The
_pam_systemd_ module ensures that the right `DBUS_SESSION_BUS_ADDRESS` is set at
login.

This also permits dbus-daemon to defer to systemd for activation instead of
spawning server processes itself. However, currently this is not commonly used
for session services (as opposed to system services).

_kdbus_ will only support this model, so this is also an opportunity to iron out
some bugs and make a future transition to kernel buses easier. Please let us
know of any issues.

URL: https://www.archlinux.org/news/d-bus-now-launches-user-buses/
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