Bug#835836: autopkgtest: please switch setup-commands/ubuntu-touch-session from dbus-x11 to default-dbus-session-bus

[smcv@debian.org (Simon McVittie)]

Source: autopkgtest
Version: 4.0.4
Severity: normal
User: dbus at packages.debian.org
Usertags: dbus-launch default-dbus-session-bus

As described in <https://lists.debian.org/debian-devel/2016/08/msg00554.html>
I'm trying to reduce how much dbus-launch is used in Debian.
setup-commands/ubuntu-touch-session in autopkgtest currently installs
dbus-x11.

As far as I can tell, this package falls into the "other software that
relies on D-Bus" category from my debian-devel mail: instead of dbus-x11,
please consider installing default-dbus-session-bus, which is a virtual
package currently provided by dbus-user-session.

Thanks,
    S