ttcn3-pgw-test: configure the 'ogstun' device for open5gs-upfd

Unlike osmo-ggsn, open5gs-upfd does not configure the tun interface
itself.  All IPv4/IPv6 addresses must be assigned manually.  This
is exactly why both PGW_Tests.TC_createSession_ping4[_256] fail:

  [sock] ERROR: ogs_write() failed (5:Input/outputerror) (../lib/tun/tunio.c:84)
  [upf] WARNING: ogs_tun_write() failed (../src/upf/gtp-path.c:448)

Take Harald's setup.sh from open5gs-master and execute it in the
container running open5gs-upfd.  This fixes the ogs_write() errors.

Change-Id: I0730b1f69285484a0aa0ebd664dafd8e476b294f
Related: SYS#5602

ttcn3-pgw-test/jenkins.sh

@@ -16,6 +16,7 @@ cp osmo-uecups-daemon.cfg $VOL_BASE_DIR/osmo-uecups/
 mkdir $VOL_BASE_DIR/pgw
 cp freeDiameter-smf.conf $VOL_BASE_DIR/pgw/
 cp open5gs-*.yaml $VOL_BASE_DIR/pgw/
+cp ogstun-setup.sh $VOL_BASE_DIR/pgw/
 
 SUBNET=18
 network_create $SUBNET
@@ -43,6 +44,9 @@ docker run	--cap-add=NET_ADMIN \
 		$REPO_USER/open5gs-$IMAGE_SUFFIX \
 		open5gs-upfd -c /data/open5gs-upf.yaml
 
+# configure the 'ogstun' device for open5gs-upfd
+docker exec	${BUILD_TAG}-upf /data/ogstun-setup.sh
+
 # start container with open5gs-smfd in background
 docker run	--cap-add=NET_ADMIN \
 		--device /dev/net/tun:/dev/net/tun \

ttcn3-pgw-test/ogstun-setup.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+if ! grep "ogstun" /proc/net/dev > /dev/null; then
+    ip tuntap add name ogstun mode tun
+fi
+ip addr del 10.45.0.1/16 dev ogstun 2> /dev/null
+ip addr add 10.45.0.1/16 dev ogstun
+ip addr del cafe::1/64 dev ogstun 2> /dev/null
+ip addr add cafe::1/64 dev ogstun
+ip link set ogstun up