ggsn: Bind VTY and CTRL ifaces to assigned ip addr

Change-Id: I26735a21cd53183dfe0a75e5bd24954d583c354f
diff --git a/src/osmo_gsm_tester/templates/osmo-ggsn.cfg.tmpl b/src/osmo_gsm_tester/templates/osmo-ggsn.cfg.tmpl
index 1692db6..3f2d0e7 100644
--- a/src/osmo_gsm_tester/templates/osmo-ggsn.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/osmo-ggsn.cfg.tmpl
@@ -34,7 +34,9 @@
 stats interval 5
 !
 line vty
- no login
+ bind ${ggsn.ip_address.addr}
+ctrl
+ bind ${ggsn.ip_address.addr}
 !
 ggsn ggsn0
  gtp state-dir ${ggsn.statedir}