constants.py: add CHANNEL_TYPE_DBUS_TUBE and DBUS_TUBE_SERVICE_NAME
constants.py: add CHANNEL_TYPE_DBUS_TUBE and DBUS_TUBE_SERVICE_NAME

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut