* gprs_ns2: add gprs_ns2_fr_bind_role() to retrieve the fr role
* gprs_ns2: make nsvc argument const
* gprs_ns2_sns: introduce SNS Size/Config retries
* gprs_ns2_sns: use different binds for the initial connection
* gprs_ns2_sns: rework IP-SNS initial remote
* gprs_ns2: add gprs_ns2_free_nsvcs() to free all NS-VC of a NSE
* gprs_ns2: rework gprs_ns2_fr_connect*()
* gprs_ns2: add member name to bind
* gprs_ns2: move allocation of the SNS fsm into create_nse
* gprs_ns2: introduce NS dialects