[RILMODEM] get network status from core

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

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[RILMODEM] prevent datacall slipping through when roaming disabled

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