Store initially pending messages
Store initially pending messages

This works as long as the logger won't crash. If the logger crash, it will
log again the pending, creating duplicates. More patch coming to address
the case where the logger crash and restart.

freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger