Make the regression tests work with D-Bus >= 1.5.6
Make the regression tests work with D-Bus >= 1.5.6

The tests rely on being able to eavesdrop. Since D-Bus 1.5.6, normal
match rules do not eavesdrop, even if allowed: you have to specifically
ask for it.

https://bugs.freedesktop.org/show_bug.cgi?id=41090
Reviewed-by: Will Thompson <5822fdda638242a44ccfa68f146ccf6f257c5cbd@collabora.co.uk>

freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control,freedesktop-unofficial-mirror/telepathy__telepathy-mission-control