Remap SIP status 404 to Group change reason NoAnswer
Remap SIP status 404 to Group change reason NoAnswer

This gives a middleway semantic between InvalidContact and Offline,
because proxies are known to mean any of the two reasons by this
status code.

freedesktop-unofficial-mirror/telepathy__telepathy-rakia,freedesktop-unofficial-mirror/telepathy__telepathy-rakia,freedesktop-unofficial-mirror/telepathy__telepathy-rakia