[statistics] Provide basic statistics for the NAT

Count number of SCCP connections, number of BSC reconnects,
number of calls. For most of them we have a per BSC and a
global count.

Right now all structs using the counters survive until the
end of the application so we do not need to free them.
4 files changed
tree: 32d5d9b407727cea7a1369e39ca6c0022f099593
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/