show all global counters of osmo-bsc in vty

The 'show statistics' VTY command was not showing all counters
maintained by osmo-bsc. Instead of printing just two counters
related to paging, print all available counters in a generic way.

Adjust descriptions of some counters for nicer display.

After startup (all counters are zero) is now looks like this:

OsmoBSC# show statistics
       handover:attempted:          0 Received handover attempts.
      handover:no_channel:          0 Sent no channel available responses.
         handover:timeout:          0 Timeouts of timer T3103.
       handover:completed:          0 Received handover completed.
          handover:failed:          0 Received HO FAIL messages.
         paging:attempted:          0 Paging attempts for a subscriber.
          paging:detached:          0 Paging request send failures because no responsible BTS was found.
         paging:responded:          0 Paging attempts with successful response.
OsmoBSC#

Change-Id: I58ae04e1960774d760e3ebb54a4f307c9f753655
Related: OS#3245
2 files changed