test-plugin.c: add more special usernames whose channels are terminated with new API, old API, or new API with a reason
test-plugin.c: add more special usernames whose channels are terminated with new API, old API, or new API with a reason

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