Merge pull request #226 from jpoutiai/master

more default logging
[RILMODEM] refactor gprs-context driver

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[RILMODEM] refactor gprs driver

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>