* CTRL_Adapter: Keep server alive after first client disconnects
* IPA_Emulation: Support keeping server alive after first client disconnects
* CTRL_Adapter: Add function f_ipa_ctrl_wait_link_down
* gbproxy: Test suspend + resume for each NRI on each SGSN
* gbproxy: Use correct NRI in suspend/resume
* gbproxy: Refactor f_TC_{suspend,resume}
* gbproxy: Start to allocate NRIs to SGSNs
* gbproxy: Fix TC_fc_bvc() with more than one SGSN
* gbproxy: Move away from random TLLI
* Add f_gen_tmsi() to generate a TMSI similar to f_gen_{imsi,imei}()
* gbproxy: Configure a Second SGSN