Automated oFono/rilmodem Testing

Currently, the only automated testing of oFono, and more specifically the rilmodem driver used to control rild, is via a set of ofono unit tests which validate the parsing of rild-specific parcels used for communication with rild.

We would like to invesigate resources into developing some kind of automated testing that exercises more of the rilmodem code base than the current set of unit tests, with a secondary goal of being able to run these tests as part of the oFono CI process. As there's currently no clear solution on the table, initially most of the work items for this blueprint are of the investigative type.