osmo-msc: configure HLR address

In db59bcf9fcdc5f05fdb9047b905ab497472440bc we added a configured GSUP server
address for the osmo-hlr, but the osmo-msc is still trying to connect to
127.0.0.1.

In the same way as for mgcpgw, add conf_for_msc() to OsmoHLR, and use that to
configure the HLR's address in osmo-msc.cfg.

Related: OS#2320
Change-Id: I005aa160c679fc92b248abd762888959bd5b2c55
diff --git a/src/osmo_gsm_tester/osmo_msc.py b/src/osmo_gsm_tester/osmo_msc.py
index ca0e246..2ef88df 100644
--- a/src/osmo_gsm_tester/osmo_msc.py
+++ b/src/osmo_gsm_tester/osmo_msc.py
@@ -72,6 +72,7 @@
         config.overlay(values, self.suite_run.config())
         config.overlay(values, dict(msc=dict(ip_address=self.ip_address)))
         config.overlay(values, self.mgcpgw.conf_for_msc())
+        config.overlay(values, self.hlr.conf_for_msc())
 
         self.dbg('MSC CONFIG:\n' + pprint.pformat(values))