Bug#1079481: fwupd-tests probably should not depend on dbus-x11

[Simon McVittie <smcv@debian.org>]

Source: fwupd
Version: 1.9.24-1
Severity: normal
User: dbus@packages.debian.org
Usertags: dbus-launch

fwupd-tests Depends on dbus-x11, which contains dbus-launch, a mechanism
for running a D-Bus session bus in X11 sessions.

I don't think fwupd-tests actually needs this: as a system service, it
seems more likely that fwupd needs the D-Bus *system* bus, which can be
provided by either dbus (the reference implementation and currently
Debian's default) or dbus-broker (a reimplementation which is available
as a non-default, and is the default in some other distributions).

I'm testing a patch to replace the dbus-x11 dependency with
default-dbus-system-bus | dbus-system-bus, which will pull in Debian's
default implementation of a system bus, whatever that might be now or
in the future.

    smcv