StreamTubeServer: Ignore invalid and non-Open tubes in tcpConnections()
StreamTubeServer: Ignore invalid and non-Open tubes in tcpConnections()

This prevents a few useless warnings in corner cases where a tube is still being opened, or has been
invalidated but we haven't processed that event yet.

TelepathyQt/telepathy-qt,TelepathyQt/telepathy-qt,anantkamath/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt,special/telepathy-qt-upstream,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,detrout/telepathy-qt,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,TelepathyQt/telepathy-qt,tiagosh/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,tiagosh/telepathy-qt,detrout/telepathy-qt,anantkamath/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4,freedesktop-unofficial-mirror/telepathy__telepathy-qt,anantkamath/telepathy-qt,TelepathyIM/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt,special/telepathy-qt-upstream,TelepathyIM/telepathy-qt,special/telepathy-qt-upstream,tiagosh/telepathy-qt,detrout/telepathy-qt,freedesktop-unofficial-mirror/telepathy__telepathy-qt4