Use reserved ip address for osmo-hlr GSUP interface

Otherwise 0.0.0.0 was being used and we want all interfaces for a
specific osmo-hlr instance to use the same IP

Requires osmo-hlr change id I79f7a300480f308b21116dd14d1698be38725afd
otherwise osmo-hlr won't be able to parse the configuration file.

Change-Id: I4e0063abc8de3d739ebd81942b692cc2e75792f1

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

@@ -10,3 +10,6 @@ line vty
  bind ${hlr.ip_address.addr}
 ctrl
  bind ${hlr.ip_address.addr}
+hlr
+ gsup
+  bind ip ${hlr.ip_address.addr}