Read messages left over in ME storage on startup.

On modems that don't support +CMT (or for class 2 SMSes) the messages are
stored in the modem and then read and deleted from there in two separate
steps with no warranty that deletion succeeds or (more likely) power is
cut before the deletion happens.  Over time the memory may become full
and if we don't want to deal with this condition we need to check on
startup if there are messages we haven't deleted.

We can't differentiate between those messages and those the user already
had on the SIM / modem before installing ofono or switching phones, so we
might want to deliver messages with REC READ status with some kind of
indication that these are potentially old so the UI doesn't emit spurious
alerts.  We don't do this now and just deliver as usual.

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