gbproxy: Move away from random TLLI

We used to generate a random TLLI for each ConnHldr.  Instead, use a
deterministic function to generate the P-TMSI (just like we do for the
IMSI) and derive a local TLLI from that P-TMSI.

Related: OS#4472, SYS#5002
Change-Id: Ic1eaa1d298fe998ca97432769953bfc5a5333ae4
2 files changed