[RILMODEM] hardening phonebook driver implementation

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
Merge pull request #223 from jpoutiai/master

[RILMODEM] hardening phonebook driver implementation
[nettime] Export test script to .rpm
[nettime] Prevent crash if MNC or MCC is missing
Merge pull request #225 from marttipiirainen/nettime

Fix crash in network time plugin