[GPRS] NS: Start to use rate_ctr_group code from libosmocore

Every NS-VC now has a set of counters for incoming and outgoing
number of packets and bytes.

We also split the VTY part of the gprs_ns.c implementation into gprs_ns_vty.c
to make sure the protocol can actually be used without the VTY code being
present.
3 files changed
tree: c6b09ded53e9a4d57cd2d3464531b6af535a34f6
  1. openbsc/