ofono: status=registered signal sent to ofono users before being attached
ofono signals to its users that a modem is attached before receiving first "Location Update Accept", that is before being really attached. This is a source of problems for our tests as we need to know reliably whether the modem is attached or not. We should try to fix this as soon as possible because it's making us lose a lot of time with errors in tests and preventing us to add new tests to the default suite.
Issues detected so far:
- If a test tries to send a USSD code immediately after receiving the "registered" signal, it will fail because modem is still not really attached.
- If a test tries to validate that with auth/encryption in the network and with a bad KI it will be rejected, we still see the status="registered" signal sometimes until it is finally rejected.