gbproxy: Switch to IP-SNS on the BSS side

When testing gbproxy with an IP BSS, we want to use IP-SNS as that
is the more relaistic use case in practice.

This un-breaks the dockerized tests since I90bd101096979b170c38fa2a80abb80d296c4d2e
was merged in osmo-ttcn3-hacks.git

Change-Id: Id1324e019b7f148f8d33977c0089e996089e1e59

ttcn3-gbproxy-test/GBProxy_Tests.cfg

@@ -56,33 +56,39 @@ GBProxy_Tests.mp_nsconfig_sgsn := {
 }
 GBProxy_Tests.mp_nsconfig_pcu := {
 	{
+		handle_sns := true,
 		nsvc := {
 			{
 				provider := {
 					ip := {
 						local_ip := "172.18.24.103",
+						remote_udp_port := 24000,
 						remote_ip := "172.18.24.10"
 					}
 				}
 			}
 		}
 	}, {
+		handle_sns := true,
 		nsvc := {
 			{
 				provider := {
 					ip := {
 						local_ip := "172.18.24.103",
+						remote_udp_port := 24000,
 						remote_ip := "172.18.24.10"
 					}
 				}
 			}
 		}
 	}, {
+		handle_sns := true,
 		nsvc := {
 			{
 				provider := {
 					ip := {
 						local_ip := "172.18.24.103",
+						remote_udp_port := 24000,
 						remote_ip := "172.18.24.10"
 					}
 				}

ttcn3-gbproxy-test/osmo-gbproxy.cfg

@@ -31,15 +31,18 @@ sgsn nsei 102
  name second
  nri add 4
 ns
- bind udp local
+ bind udp sgsn-side
   listen 172.18.24.10 23000
-  accept-ipaccess
  nse 101
-  ip-sns-bind local
+  ip-sns-bind sgsn-side
   ip-sns-remote 172.18.24.103 7777
  nse 102
-  ip-sns-bind local
+  ip-sns-bind sgsn-side
   ip-sns-remote 172.18.24.103 8888
+ bind udp bss-side
+  listen 172.18.24.10 24000
+  accept-dynamic-ip-sns
+ ip-sns-default bind bss-side
  timer tns-block 3
  timer tns-block-retries 3
  timer tns-reset 3