osmo-msc: Use mgw instead of mgcpgw in cfg

As of osmo-mgw 87203f2a3746d708f85ee75d978e2821bda58e6d, mgcpw commands
are deprectated.

Change-Id: Ib0220c9f7f6262234712c3195dda0e076c7dd390
diff --git a/src/osmo_gsm_tester/osmo_mgcpgw.py b/src/osmo_gsm_tester/osmo_mgcpgw.py
index 93c3a7c..665c151 100644
--- a/src/osmo_gsm_tester/osmo_mgcpgw.py
+++ b/src/osmo_gsm_tester/osmo_mgcpgw.py
@@ -81,7 +81,7 @@
         return self.ip_address.get('addr')
 
     def conf_for_msc(self):
-        return dict(mgcpgw=dict(ip_address=self.ip_address))
+        return dict(mgw=dict(ip_address=self.ip_address))
 
     def running(self):
         return not self.process.terminated()
diff --git a/src/osmo_gsm_tester/templates/osmo-msc.cfg.tmpl b/src/osmo_gsm_tester/templates/osmo-msc.cfg.tmpl
index 6851ea9..9ac68b3 100644
--- a/src/osmo_gsm_tester/templates/osmo-msc.cfg.tmpl
+++ b/src/osmo_gsm_tester/templates/osmo-msc.cfg.tmpl
@@ -20,7 +20,7 @@
 cs7 instance 0
  point-code 0.0.1
 msc
- mgcpgw remote-ip ${mgcpgw.ip_address.addr}
+ mgw remote-ip ${mgw.ip_address.addr}
  assign-tmsi
  cs7-instance-iu 0
  cs7-instance-a 0