VTY: Add 'show connections' and 'show transactions' commands

It is quite important to have some way of runtime state introspection
about the major objects inside osmo-msc.  This patch adds some basic
capabilities to dump the most important information about
subscriber_connections and transactions (like calls/sms).

OsmoMSC> show connection
--ConnId ------------Subscriber RAN --LAC Use --Tokens CSA A5 State
00000001    IMSI:26242000000006   A    23   1 00000004 --- /0 SUBSCR_CONN_S_COMMUNICATING

Change-Id: I1c457c1eac20188f67b8379a36cfda3a085fcef4
1 file changed