mgw: Rename IP address module parameter specifying IP version

Change-Id: Ia393d7175de277ec8fa524ba74bf3b150b74c766
diff --git a/mgw/MGCP_Test.default b/mgw/MGCP_Test.default
index 4336033..35f7ed0 100644
--- a/mgw/MGCP_Test.default
+++ b/mgw/MGCP_Test.default
@@ -14,9 +14,9 @@
 
 [MODULE_PARAMETERS]
 mp_local_udp_port := 2727;
-mp_local_ip:= "127.0.0.1";
+mp_local_ipv4:= "127.0.0.1";
 mp_remote_udp_port := 2427;
-mp_remote_ip:= "127.0.0.1";
+mp_remote_ipv4:= "127.0.0.1";
 Osmocom_VTY_Functions.mp_prompt_prefix := "OsmoMGW";
 
 [MAIN_CONTROLLER]