Use reserved ip address for osmo-bsc ctrl interface

Otherwise 127.0.0.1 was being used and we want all interfaces for a
specific osmo-bsc instance to use the same IP

Change-Id: I38dccac6707bf55f0abcf96e3a9d7d8ec765a156

src/osmo_gsm_tester/templates/osmo-bsc.cfg.tmpl

@@ -8,6 +8,8 @@ log stderr
 line vty
  no login
  bind ${bsc.ip_address.addr}
+ctrl
+ bind ${bsc.ip_address.addr}
 e1_input
  e1_line 0 driver ipa
  ipa bind ${bsc.ip_address.addr}