Merge branch 'zecke/jolly-sms'

MT-SMS:
Manual test with VTY to phone. Also multiple SMS deliveries on
the same lchan. Manual test with phone to phone.

MO-SMS:
Manual test with phone to phone but only a single SMS at a time,
not testing the special 'CP-ACK' case.

Forced CP timeout using the fakebts SMSTest, not causing a crash.