src/salut-tubes-channel.c: better debugs when the contact accept/decline the tube offer
src/salut-tubes-channel.c: better debugs when the contact accept/decline the tube offer

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