ttcn3-ggsn-tests-ogs: Set correct DNS address to get ping working

The DNS address provided is used by the test to ping. In osmo-ggsn, we
configured the DNS to be the shared address between GTPC and GTPU. In
open5gs, the addresses are different. Hence, let's pass the GTPU address
instead of the GTPC address to make the setup easier (no need to have
proper routing working between UPFD and SMFD containers).

Change-Id: I2a452ad871612d1c88b94579dadbe62b718b1475

ttcn3-ggsn-test/ogs/GGSN_Tests.cfg

@@ -16,8 +16,8 @@ GGSN_Tests.m_bind_ip_gtpu := "172.18.3.202"
 GGSN_Tests.m_ggsn_ip_gtpc := "172.18.3.201"
 GGSN_Tests.m_ggsn_ip_gtpu := "172.18.3.222"
 # GGSN announced DNS address
-GGSN_Tests.m_ggsn_ip4_dns1 := "172.18.3.201"
-GGSN_Tests.m_ggsn_ip6_dns1 := "fd02:db8:3::201"
+GGSN_Tests.m_ggsn_ip4_dns1 := "172.18.3.222"
+GGSN_Tests.m_ggsn_ip6_dns1 := "fd02:db8:3::222"
 GGSN_Tests.m_ggsn_impl := GGSN_IMPL_OPEN5GS
 
 [EXECUTE]

ttcn3-ggsn-test/ogs/smfd.yaml

@@ -349,9 +349,9 @@ smf:
         dnn: inet46
 
     dns:
-      - 172.18.3.201
+      - 172.18.3.222
       - 8.8.8.8
-      - fd02:db8:3::201
+      - fd02:db8:3::222
       - 2001:4860:4860::8844
     mtu: 1400
     freeDiameter: /data/freediameter.conf