telit: detect modem model to specialize #BND parsing
Some behaviors of Telit modems might change with the model, for example the meaning of the #BND command output.
However, since models that share specific code numbers of the revision string have the same behavior, this MR uses the revision string to detect the modem model, and then uses such information to decide what is the proper way to parse #BND command.
fixes #487 (closed)
Edited by Carlo Lobrano